Okay. Here's a quick guide to fixing that.
Step 1: Go to
www.edge-gamers.com/join/
From here click the "Maul Registration" button. You will be brought to a page that shows your personal account MAUL info (admin capability, etc) on the top left, and then your game ID's in the bottom left. Your SourceID is blank. And that's the problem.
TO FIX IT:
On this page, click the "Edit My Game ID's" button in the top right of your screen. After you have done this, you will see a large green button on the bottom left that says "Log in through Steam." Click it, and follow the instructions. After you have done this, it should take you back to the "Edit my Game ID's" page, from where you must click "Save Changes" in the bottom left.
Step 2: After you do this, you will be brought back to the MAUL home screen with your name, sourceID, UID etc. on the left. You should now see a long string of numbers constituting your SourceID. You're almost done!
Click the "Division" dropdown on the top left of your screen, and put it at the division you so desire. Afterwards, you are completely ready to go back to
www.edge-gamers.com/join/ and click the "Application to Join" button, applying for whatever division you want!
Let me know if you have any questions, and hope to see you around!
-Minty <3