Register/Login for app

I've been reading the help files and I can't figure out if this is possible.

I want users to be able to add themselves to a table (by registering) and when they come back, they can login and see specific information regarding them from other tables. The thing is, I was thinking of having two forms - one for registering and one for logging in, with an opening dummy form saying "Do you want to login or register?" and then redirecting them to the appropriate place. I saw that it was possible to place links to other outside pages but how can I redirect the user to a form in my app?