I changed it for you. It doesn't take it from the checkboxes. When you make a new thread there is a dropdown box right next to the title text box to pick the prefix. Either you can't edit the prefix of your own thread, or you can't do it if it was made before the prefix option was added... not sure which.I ticked the CTF prefix box for my thread, but it doesn't show up next to the name on the main maps page.