auto morph for group id. NO BUTTONS?

Do do this you'd utilize the Player.CharacterAdded and Player:GetRankInGroup events. Using these, you'd morph the player's character to your desired appearance everytime the player respawns, and only if they're in the group.

game:GetService("Players").PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		if player:GetRankInGroup(GROUP_ID) >= RANK then
			--// Do something to the character
		end
	end)
end)

But next time, please make an effort to make your own script first before posting questions here.