rp_finalizer

Hi Guys
Hopefully I’m in the right place, my son has GM and has created a Star Wars server. He wants to add the rp _finalizer map and so far has added it to his collection but then gets stuck. Could somebody please explain the process for installing a map once it is in your collection.
Regards
Ian

you should find thid of some help https://www.youtube.com/watch?v=SgQDLnejkws