Hi which file has the information on how many characters a username can have. Right now, i believe you need to have more than 3 letters i'd like to set this to 2 letters.

bb_func_checkusr.php

Change $userRegExp="#^[".$userRegName."]{3,40}\$#";

istead of "3" type "2".

Any way to limit the amount of letters in a username?

user_dataform.html - limit maxlength of the login field here.
bb_func_checkusr.php - limit {3,40} to {3,MAXLENGTH} here.

Thank you Paul.

Thank you Paul.

My little addition - if you change the script above, it will be still a core-destructive solution.

However, it's more than simple to change "login" field's maxlength in templates/user_dataform.html for example, also as "user_usr" in templates/user_login_form.html. Of course an experienced "hacker" will be able to register longer username, if you don't change bb_func_checkusr.php. But for 95% of users it won't be an easy and even possible task ;-)

I think there is a bug for bb_func_checkusr!

I set this $umin=4; and $umax=14; but they still can register with 15 character, and also in dataform they still can enter 15 even $umax is 14.

I'm using new version.. any one got same issue or can help?

Ok found it.. it was in Index.. and made it to 14 now :)

From the manual:

You may try to add/unslash these settings in setup_options.php without destroying the most important core file.

Thanks for that :)