BuddyPress No "Register" Page!

I've not done anything crazy with this new site I'm building.

Enabled Network in Wordpress after I installed it.

Uploaded and am using a BuddyPress theme, from WPMU Dev (Studio Theme).

Installed and activated both Membership plugin, as well as BuddyPress.

But for some reason, if I go to Sign-Up/Join, as a user would -- the page cannot be found.

What am I missing??

Here's the site as at appears today: http://whogotnextnow.com/

Thanks for your help, in advance.