Invite Anyone Plugin for Buddypress

I have been spinning my wheels on this one and was wondering if anyone could help. I have a registration form on every group page, so for this plugin, I want the %%ACCEPTURL%% to go to the group the person is inviting from. In other words, upon receiving the email and accepting the invite, they are taken to that group page to join.

http://wordpress.org/plugins/invite-anyone/description/

Thx