How to change map in StarCraft 2 custom game from 1v1 map

Question

I just got Wings of Liberty and I want to play some 4v4's with AIs so I'm not horrible against my friends when we play.

I'm trying to add a game in the custom games and it's just letting me do 1v1 but I can't seem to change the map so I can put in more players.

How do I change the map from Xel'Naga Caverns to something else?

Answer 1

Step 0: Make sure you have a real copy of Wings of Liberty, and not the starter version. From Blizzard's FAQ:

Step 1: From the main menu, pick Custom Games (or hit F3).

Step 2: Pick "Browse" on the left, then set it to show Blizzard maps in the Melee category.

Step 3: Scroll down and pick some larger maps.