You need to have the same minecraft version then make sure he is on the same wifi as he is. You then to make sure both have the option server is visible. Then one has to be on a map and the other has to be in join game then it should show your names then shazam after a while you are joined in
You should have IOS 6.0.1 1. You have to have wifi in the house! 2. Go on minecraft press join game 3. It will load it will show the other players name 4. Click it! Then it will load! 5. Wait!.......... 6. Once it's done loading start playing!