You are not using Winbox 7.18.2, you are probably using RouterOS v.7.18.2 through either Winbox v.3.xx or Winbox v.4.xx
Follow instructions here:
and post your configuration.
Conceptually you need to put all your interfaces (ethernet and wi-fi) into a bridge.
This bridge (and not the single interfaces inside it) might be assigned an IP, this IP is not strictly needed if you access the netmetal only through Winbox, see:
Quickset is better NOT used, but if you really want to use it, use it ONLY ONCE and after a device reset, see Rule #4 :
The problem is that when you run Quickset more than once, some of the settings of the previous run may not be updated, leading to an inconsistent configuration.