How can I store a players variable?

I have a server script in a gui and I need to find a way to get the players variable, I tried using remote events but it didn't work. I need to store the players variable

while true do
		
	
		
			
		
	wait(1)
		
	script.Parent.Text = "Pick a map"
			
		
			
		
			
				
			if plr.Map.Value == 1 then -- I need the players variable to do this
				
			
				if game.Workspace.Wave.Value == 1 then
				-- the rest of my code this is a snipet to show u
-- I know there isn't any ends here