BuddyPress.org

Alternatively, go to Site Admin > Invites. Then in Invites panel click on “Edit Settings” link. Some things to watch out for if you’re using bp-default or its child theme:
== What is the address of the signup page? (wp-signup.php is the default)
Signup page == make it register.php
== What address do you want the invitation emails to send people to? Please add the full URL to the registration page.
Signup page == if BP is installed in main site == http://yoursite.com/register.php . Or if BP is installed in sub-blog == http://yoursite.com/subblogname/register.php or http://subblogname.yoursite.com/register.php