Discord - help!

[AngryApples]

OK,

I give up -

How do you add a server to Discord (that is, add someone else's pre existing server)?

All the you tube vids show a "create server / add server" box popping up, but I didn't get that and can't seem to find "add server" in the interface


I'm guessing it's staring me in the face


Thanks in advance...