Help w/ making a follow friends GUI?

You need to use GetFriendsOnline, GetPlayerPlaceInstanceAsync, and TeleportToPlaceInstance

This is an example of what you could do

--The whole script has not been tested, change it your likings

function GetFriends(player) --I do not feel like upvaluing it
	return player:GetFriendsOnline(200) --max is 200 
end 

function GetFriendsInGame(friends)
	local new_friends = {} --dont mean it like thatl
	local placeid = game.PlaceId
	local temp 
	for x = 1, #friends do 
		temp = friends[x] 
		
		if (temp.IsOnline) then 
			if (temp.PlaceId == placeid) then 
				new_friends[#new_friends + 1] = temp 
			end 
		end 
	end 
	
	return new_friends 
end 


--you could make a gui that selects a friend, and maybe hit follow friendinto game 
--if you do you then do 

function FollowFriend(player, userId) 
	--player == main player, userId == the player to follow 
	--(if this was for the gui, and the player hit the follow button for the player, you would provide the VisitorId from the online friends table)
	local tp = game:GetService("TeleportService")
	
	local success, emsg, placeId, instanceId = tp:GetPlayerPlaceInstanceAync(userId)
	
	if (success) then 
		tp:TeleportToPlaceInstance(placeId, instanceId, player)
	else 
		warn(emsg)
	end 
end 	

Cite: GetPlayerPlaceInstanceAsync GetFriendsOnline TeleportToPlaceInstance