Mujinu

I'm new to this...I downloaded GTA III - I can play the story mode...I wanna play "MTA" Now...So how do I join servers? I go to a server list and typed the number in the MTA thing...Then it says "password" (whats that) when I finally hit connect I cant connect (10 Second delay) I just dont get this at all! ANYTHING! Please help... THANKS )=