Hide Prosites signup registration form

Hey,

I have ProSites installed and would like to know how I can revert the registration form back to hidden.

For example, a user clicks the signup button and the screen scrolls down to the registration form but if I want to hide it again how could I do that with a link or button so that once it is clicked the registration form will be hidden again?

Let me know!

Thank you,

Landon