This is a tutorial that I made for another forum about installing myBB step by step and I thought that I should post it here too. I didn't know which section was the most appropriate so I just posted it here. So, from this point on it's simply a matter of paste...
I am a big fan of the myBB forum script so I made this tutorial for those who want to try it and give it a shot.
First of all, let me tell you a few words about myBB. It was often called "vBulletin's little brother". It resembles it very much. It has a similare structure and unlike smf or phpBB it comes with an user CP. Since I started using it I gave up on smf or phpBB.
Now, let's get to the point.
First of all, you must download the install kit from here. Next, you must upload it via ftp to your host's servers. As a good ftp client I reccomend FlashFXP. If you want to install a portal too afterwards, it would be better if you installed in a directory named 'forum' instead of doing it in the root directory.
When your finished, type in your browser an adress like
www.yoursite.com/install/
if you installed it in the root directory or
www.yoursite.com/forum/install/
if you did in a directory named 'forum'. Now, an installer will appear. If it doesn't you must verifiy the following things: 1. Make sure that you have uploaded the files correcty and you kept the directories structure
2. Make sure that you have uploaded the .php, .html, .css and any other text file in ASCII mode, and that you have uploaded the .gif, .jpg, .png, and any other binary file in Binary mode
If an installer appears, you should follow the next steps:
1. First page is an Welcome page. Just press the next button.
2. Second page contains the License Agreement. Read it carefully and then press next.
3. Now, depending on how you uploaded the files and your server's settings, you might receive an error that will say that a list of files aren't CHMOD-ed correctly. Make sure that all that files's CHMOD are 777 or 0777. After you did that, refresh the page and it should take you to... see 4. below 
4. Database configuration step. You must complete those fields with the informations required. The fields are:
- Database Engine ( this is the engine that you wish to use. Most likely, there is only MySQL or something similar, so this should be the right choice for you. If you have the option between MySQL and MySQL Improved, usually the Improved is the better choice )
- Database Host ( this is the server where the database is. Unless told otherwise by your host, this should be localhost. For newsit.es it's localhost per example )
- Database Username ( this is the username you created or you use to access your database for MyBB. On newsit.es it would look like accountname_username. Account name is your account name and username is the username that you created for the data base. )
- Database Password ( this is the password for the database username that you entered. On newsit.es is the same as your accunt login password )
- Database Name ( this is the name of the database that you would like MyBB to install to. On newsit.es it would like accountname_databasename. Database name is set by you, just like database username from above. You can create them from Create Database menu, from your CPanel's menu )
- Table Prefix ( his is the prefix for the tables in the database. Unless you already have a MyBB installation in the database you entered with the prefix mybb_, you should leave this how it is. If you do already have a MyBB installation in the database, you should change it to something else. To be honest now... I heard it's kinda difficult to run two myBB forums on the same database so you should use only one. It's not like you would really need two myBB forums on the same database, right? )
After you complete those fields, press next. If you receive an error it means that you didn't complete them correctly. Contact your host for the right set of informations if you aren't sure what they are.
5. Now, the installer creats the tables in the database and it tells you that it did that. This step seemed allways kinda stupid to me, so just press next. It's not like you need that information anyways. You can see the tables created from phpmyadmin if you are interested 
) Just press next.
6. Data insertion now.... it populates your tables. The same, just press next.
7. Now it installs the theme. Another usseless thing to be seen by the user because you can't choose right now a theme so there is no user input here. Press next.
8. This step is important. Now you configurate your board. Complete the fields with the required information. Below is a list of the fields.
- Forum Name ( this is the name of the forum that you are installing. By default, it is "Forums". Change it to your site's name or whatever... Just make sure you like the name ) )
- Forum URL (this is the URL to your forum. This should be filled in automatically, but it is always good to make sure that the URL is correct. Remember that there should not be a trailing slash at he end ( http://www.site.com/forum not http://www.site.com/forum/ or wherver you installed it.
Have fun and enjoy your freshly installed myBB forum! I sure did!
