How does the world builder work??!!

[hardcore_gamer]

I just downloaded the Civ 5 SDK and started the world builder. But for some reason I can only generate maps but not create new ones myself!

How can I create my own map?

Where are all of the menus?

EDIT: Never mind, I solved it myself.

 

[Kruelgor]

There's a button there that says something like generate blank map.