Main router is connected to the ISP.
One cable is connected from the Main Router to another mikrotik router in ether port2
Create bridge between ether2 and wlan
Configure the wlan and set ssid and password
Create a static ip and set proper dns
tips: if you reset the mikrotik, the default ip is 192.168.88.1
After you change the ip, connect the laptop the router directly and set the ip address of your laptop to match with the main router ip