Join a Roblox Server using PlaceID and JobID?

Assuming you've already figured out how to obtain the PlaceID and JobId, you can then use this Teleport Service method to put them into action:

local TeleportService = game:GetService("TeleportService")
TeleportService:TeleportToPlaceInstance(placeId, JobId, player)

Note that the third argument, "player", is only required in server scripts. In a local script, omit it. In a server script, give it the player instance itself "game.Players.Uglypoe".

Note that it doesn't always work correctly, as teleport service is extremely buggy. Good luck and hope this helped!

It is an string like example:

while true do
print(game.JodId)
wait(1)
end

But this page may can help you better.