The most important thing to do is to sign up to Skype. It's free. You can make your user name whatever you want, but we try to keep it similar to our HM names. Mine is azathoth1945 .
Once you do that, post your Skype name on "what is your Skype name?" thread.
Then the easiest thing to do is search "Contacts" on Skype, look for my name, and send a "friend request" (or whatever it's called) (Add "from HM" in the comment section). I get it, I add you to my HM list, you're in.
As for actually watching the movies, everyone either:
Has their own disc
Has a copy on their computer
Uses Netflix (if available)
Uses Youtube (if available)
Finds another way to get/see the movie.
Once you download Skype, the next 2 steps are quick to do (though it depends on when I get around to checking to add you. For tonight it won't be long.