How to use "bottom corner chat" on signup page ONLY

Hi - How to use bottom corner chat on signup page only? I want to talk to people who are visiting my sign up page.

I see many people click on signup link, but few of them actually signup, thats why I want to be able to talk to them and see if they face any specific problem during signup.

By the way, I am using Anti-splog plugin which moves my signup page every 24 hrs.

Thanks,
Jamshid