screen uses a lot of cryptic keycombination to run,
you will get the hang of them quiet quickly.
"Simple Screen session:"
type "screen" to start a screen,
You can issue commands from here.
Think of screen as a kind of console windowmanager.
to get another screen (so you have to simultanious screens)
Hold the "CRTL" key and type "a" then "c", then release the "ctrl"- key.
To hop between the various screens use:
"ctrl" then "a" then "n",
Think of the "ctrl" "a" kombination as a sort of screen-command.
To read the online help:
"ctrl" then "a" then "?"
To leave your runing screen (but to leave any programms inside your screen running, and to be able to connect to it later)
issue a "ctrl" - "a" - "d".
To enter your screen again:
"screen -x", and your back again.
I hope you get the picture,
this should get you started.