1. Find and click the "Games support" link at the bottom of every page
2. Find and click the game you're looking for by searching for part of its name in the "Games support" search box ("Unreal" should be enough to find it)
3. Click the "I can't find solution for my problem" link on the right-hand side.
4. Choose "multiplayer key request" in the "Problem type" box.
5. Type something appropriate in the subject and message boxes, fill in any other information and send it away.