PM: Pm stands for primary Maintenance of ЁЯЪВ Train.
SM: SM stands for Secondary Maintenance Of ЁЯЪВ Train.
PT: PT stands for Premium Tatkal that means in the particular train Premium Tatkal Quota is Available.
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Yes, You can edit train like News,Rake,Train Photo,Stops,Loco,Etc. And when you edit train it will automatically become TL. Then the TLm Monitors confirm your entry. But you should to give Proof of News also. And if your entry is wrong it will be Void.
When you have 400-500 Confirm TLm, then you should contact to Resp. Moderator Sir to became you as TL monitor.
Private means you should message any member by replying him in private.
Rf clubs: It means This is a club of Railfans of particular station or division or zone.
Hope this info. will help you.
Thanks ЁЯСН