OSX SkyFighters 1945 MB 1 - Select World tab

When you first create a mission, the Mission Builder will present you with the "Select World" tab:

You won't be allowed to access any of the other tabs until you select a world and click the "Add World" button near the top right. You'll have your choice of six worlds/locations: See OSX SkyFighters 1945 Locations ("Worlds") for more information on these locations.
 * 1) Island World
 * 2) Fantasy Island
 * 3) Mountain World
 * 4) Solomon Islands
 * 5) Iwo Jima
 * 6) Philippines

When you select a world from the drop-down menu, an overhead map of the world will be displayed in the square box in the upper-right. Once you click the "Add World" button, a scrollable view of the world will appear in the box at the bottom of the window. Below is how it looks after selecting and adding "Island World":

While it's technically possible to change the world you've selected, doing so after you've placed aircraft or objects really wouldn't make any sense -- what was an airfield location in one world will almost certainly be something else (in the water, inside of a mountain) in another.

While you're encouraged to save your mission often as you edit, don't click the "Save As..." or "Save" button just yet. First you'll want to set the mission's name in the "Mission Text" tab.

Next: OSX SkyFighters 1945 MB 3 - Mission Text