Learning how to navigate the DCUO can be vexing at times, and aside from small details you learn over time (e.g. "lf Dox = looking to join a group for a Paradox bounty), phasing into a different phase can at first be confusing. Essentially, the DCUO has numerous servers, and if you want to change from one phase to another - essentially the same "world", but inhabited differently, the process (on PC) is:
1) Find the phase you want to phase into (usually by someone texting or saying something in chat)
2) F4 (Social menu)
3) Go to the "Recent Text" selection
4) A new window will open with the names of people who recently texted
5) Choose the name of the person you wish to phase with
6) A third window will open - choose the "phase with" option
Then the screen will go slightly dark, and you'll phase. If you are in the same phase, you'll just get a note in your chat box stating "You are in the desired phase". That's it - it only takes seconds, but when you are hunting... whatever, knowing how to phase between phases is a boon. Well, back to the special event (the Anti-Monitor), so see you in-world!