Just a little heads up
During the instructions it will often say (Next Image) which means you can pick the next image in line so that you can see everything that I am doing
Step 1: Insert And Login
The Xbox 360 Dashboard should appear on your television soon
Press right on your controller and select "Sign In"
It will bring you to a list of all the accounts on your xbox 360 hard drive
Pick the account that has the Xbox 360 custom map on it that you want to transfer
After you have logged on we can continue to The next step of Loading and Forging
Step 2: Loading and Forging
Wait until you are at the Halo 3 Main Menu
Move down to and select "Forge"
Once in forge Pick "MAP"
It will bring up the list of the maps that are on that account on your hard drive
Pick the map that you want transfered
In my case SQUORES
Once the map is 100% loaded you are ready for the next step which is Changing Accounts