For TA or GK, PM an SMod like steve or apple. Just send an application that you think would be appropiate. (lol idk how to spell appropiate) Tell them if you applying for GK or TA.
Afterwards, you will be discussed for 1month or longer. It took 2 months for me. Afterwards, they will tell you if you made it. If you become GK, you will moderate the GK event baord thing and have ingame op, and pink name. If TA, orange name, ingame op. Read what tehy do before applying so you know. I got rejected from TA. :/