Hi Guy I'm new to this site and (this is probably a stupid question) but how do you start or join a pug?

Edit:

I have managed to join a pug waiting server i think where i am in an aim map and it says "waiting on 9 other player" the server is 31.186.251.12:27016

i'm not to sure if this is just a waiting room for a pug or if it is a unfilled server if it is grab all your friends and come play by going into the console and typeung connect 31.186.251.12:27016