Well copy/paste the functions_forums to your functions directory, and look into the script files login.php and register.php.

I'm getting this now when I try to login

Fatal error: Call to undefined method PDO::select() in /home/taleofdr/public_html/login.php on line 63

Oh this is because you are missing the database class. Copy/paste the class_database.php and functions.php files to your site and it should work. Note you do not have to use select() or other database methods introduced in Mys v1.3.1, the old $adopts->query() and $stmt->fetchObject() still works.

Could not connect to database, the following error has occurred:
SQLSTATE[HY000] [2005] Unknown MySQL server host 'DBHOST' (1)

Did you make major changes or something? It's hard for me to upgrade b.c I have so many customizations. Now I'm all screwed up.

Yeah I did, the config file now uses PHP constants instead of variables. The new database class is being used everywhere. I can help you get rid of the constants though, and then it should be backward-compatible with Mys v1.3.0.

Ok just tell me what to do...

Do you have the old functions file? If so, just replace this line below:

with the following codes:

No, you told me to replace it with the new one.

umm so you dont have the old functions.php file anymore? If so, download Mys v1.3.0 again and use that one.

I have my old one saved but when I did what you told me to do I get this:

Fatal error: Class 'Database' not found in /home/taleofdr/public_html/functions/functions.php on line 10