Need a hand configuring Time Capsule

I have a TC with internet service from a rural wireless ISP. They provide ethernet cable which is plugged in TC WAN port. My iMac is connected to TC LAN port with ethernet cable. I configured TC manually with provided IP address.

I can get internet on iMac via ethernet but also want to connect iPhone and laptop PC wirelessly. The iPhone/laptop see the wireless network but don't connect to internet.

This is a replacement TC. I've had this working on original TC but can't seem to find the right combination of settings this time. I'v tried just about every configuration. Sometimes a setting change loses wired internet. Just can't seem to make wireless internet work again. Any ideas? Thanks.