Create a new screen session:
screen -S session_name
Detach from your screen session:
Ctrl+a d
Re-attach:
screen -r
If multiple screen sessions:
screen -ls
There are screens on:
10835.pts-0.foo (Detached)
10366.pts-0.foo (Detached)
2 Sockets in /run/screens/S-foo.
screen -r 10835