This article is from the netrek FAQ, by Tom Holub firstname.lastname@example.org with numerous contributions by others.
The first thing you should do is bring up your message window (by
hitting '?') and your player list (by hitting 'L'). Most clients will
now do this by default. On some servers, you will be asked to respond
to a question to be sure you're reading messages; if you don't respond
within a certain amount of time, you will be automatically kicked out
of the game.
Pressing a number key chooses your warp speed. The left mouse button
fires torpedos at your cursor, the middle mouse button fires phasers
at your cursor, and the right mouse button turns your ship towards
your cursor. Hitting 'h' will bring up a help window with a list of
There's a pretty good tutorial for new players at the Netrek Home