how can i do the IM thing?

seems like when im using the PM it isnt IM that suddenly pops up

or the PM and IM is the same thing tools here?

MMG has a PM function, which is like text messaging, but it isn't a chat program.

There is no IM function on MMG.

so meaning when i pm someone it actually pops up to the receiver?

but why is it there's a time that i received pm without popping?

The receiver gets it as a PM and just gets a notification of a new message popping up.