The Social Theme Intro area – is there a way for users to 'close' it?

I am pretty early on in developing this site, so please ignore all other idiocy LOL. I want visitors to be able to ‘close’ the intro section without becoming a member of the site. Membership is encouraged but not required.

Please take a look here:

I simply want the “Welcome” section to include a way to close it. Any suggestions?