Routing Failover

I’m new at mikrotik, just configured wan1 as ether1 and wan2 as lte, If I unplug cable from ether1 it automatically connects to wan2 (lte1), but how to do that automatically change route to wan2 (lte) if no internet connection. (I’ve checked tutorial wiki of Advanced Routing Failover without Scripting) but cannot understand what to replace with GW1, GW2, Host1, Host2, ISP1, ISP2, Host1A, Host1B, Host2A, Host2B…? see screenshot: