This is your Atlas. Why not add a new continent by clicking that ( + ) up there in the top right?
The Atlas is where you build your world's planets, continents, nations, cities, inns, taverns, and all the places your characters might want to visit when playing the game.
You might not realize it, but we have a bunch of stock artwork and maps you can use on your pages. You can find them when you go to pick the image for your page. To the right of your My Images link is another choice for Stock Images and Map Images.
Check out the places in the Valley of the Kings District to see an example of an Atlas.
Happy world building!