scroll down the pages in the main dei forum, or do a search with "multiplayer" things like that
there a was a thread a couple of months ago about the matter.
can't search it now 'cause I'm with a crappy notebook without mouse and every interaction with it it's a pain
or go to dei's discord channels https://discord.gg/Wez6GSY
there is a channel dedicated to mp, I think you'll surely find someone able to help you