So if I want to use alts I can't use my alt script for male and female images?

Well this question is beyond the scope of this thread is supposed to serve. Post a new thread and explain your problem in Questions/Support section.

Edit:
An glitch is found within the script file class_item.php, and I've re-uploaded Mys v1.3.1 completely. If you have an active site running already, check the bug tracker and download the attachment. It may not seem obvious to those of you running a site that aint quite active yet though.

When i registered it showed me this :

Warning: include(../inc/config_forums.php) [function.include]: failed to open stream: No such file or directory in /home/a5401752/public_html/functions/functions.php on line 314 Free Web Hosting PHP Error Message Warning: include() [function.include]: Failed opening '../inc/config_forums.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/a5401752/public_html/functions/functions.php on line 314

After I logged in It showed me this :

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[28000] [1045] Access denied for user 'a5401752'@'localhost' (using password: NO)' in /home/a5401752/public_html/classes/class_database.php:40 Stack trace: #0 /home/a5401752/public_html/classes/class_database.php(40): PDO->__construct('mysql:host=loca...', '', '') #1 /home/a5401752/public_html/login.php(86): Database->__construct('', 'localhost', '', '', 'mybb_') #2 {main} thrown in /home/a5401752/public_html/classes/class_database.php on line 40 Says that when I attempt to log in.

Sorry, but we could not find a user in the system with the name Lu Bu. Please make sure you have the username right. The user's account may also have been deleted by the system admin.

Well it means that you've specified the forum database info incorrectly.

I'll re-install everything once again, what should i not install?

Umm I dont quite understand you, what do you mean by 'what should i not install'? Theoretically you can install the adoptables site and mybb forum at any order. Make sure you enter correct database info for config_forums.php if you want mybb integration.

When my friend registered it gave him this message :

PHP Error Message Warning: include(../inc/config_forums.php) [function.include]: failed to open stream: No such file or directory in /home/a2447255/public_html/adopts/functions/functions.php on line 314 Free Web Hosting PHP Error Message Warning: include() [function.include]: Failed opening '../inc/config_forums.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/a2447255/public_html/adopts/functions/functions.php on line 314 Still shows.

Well I saw you have a newly registered user, and everything went fine?
http://www.pokemonranch.co.cc/adopts/profile.php

All right, I want the letter codes to work as well, what do I have to change?

Letter codes for what? For owned_adoptables?