WordPress MU

hi

i want to custumize this space ( when somebody click "create a blog" he or she goes http://www.mydomain.com/sign-up.php ) i want to add some php scripts and change this. . .Where is source of these ? to change and add something which php files should i edit ? Please help me with this subject. Thanks

You'll need to edit wp-signup.php and wp-activate.php. They're in the same place as wp-config

Remember to document your changes. It'll be easier to reapply them when you have to upgrade.

Thanks for your help Klarko

I mean , for example

when somebody try to sign up with "myblogmyname" the script i will add is going to change "myblogname" to "nameofmyblog" and finally the user will has nameofmyblog.mydomain.com . I have this script ( there is algorithm in it which changes spesific words to noted words. ) How will i add this script to signig up space ?
Thanks