Flint ax-1800 access point setup

I purchased 2 flint 1800 routers. First is setup as main router. How do I set up as an access point? I don't see the option.

Previously the first flint was set up as a regular router would be. I assigned a different main IP. Plugged into Netgear nighthawk and it ran fine. I do the same by plugging into a 1800 connected to wan as primary router and the second 1800 is seen by the first. But not given any access like it was with the night hawk. I hope this is clear. This is my first openwrt equipment.
If I can set up the second 1800 as an access point that would be great also.
Help!

Hello,

GL GUI > Network > Network mode, set them as the Access Point mode, and connect AX1800's WAN port to the Primary router.

With this connection method, can the AX1800 client not be connected to the Internet?

If no luck, please provide the network topology diagram.