AC1200 How to set up a pass-through (gateway) repeater

Hi,

I have a Wavlink AC1200 on DHCP obtaining a 192.168.18.x address. Then a second AC1200 set in repeater mode (connected to the first AC1200) BUT creating a new network (different IP address).

I need the one single IP address 192.168.19.x everywhere. I understand there is a ‘gateway’ button to be pressed when selecting ‘Repeater’ in setup on the second one, but this button doesn’t exist. Also the interface icons (LAN, FIRMWARE etc) are slightly different between them.

TIA