You have a single public IP assigned to your PC (iiuc). You cannot (usefully) repeat this via WiFi, but you can route it on your PC. If you have a Real OS™ (anything but Windows) on your PC, then this is straightforward - but the question is about configuring your PC instead of configuring the Gl.inet.

If you are running Windows, or don’t want to mess with your PC much, then you will have to connect the Gl.inet to the ISP (via the ether port on the Gl.inet labeled “WAN”) instead of the PC. Connect your PC to the Gl.inet via the ether port labeled LAN.

Configure your PC to use DHCP instead of the fixed IP. The Gl.inet will assign it a private IP in 192.168.8.* by default. The Gl.inet will be at 192.168.8.1 by default on the LAN port on the Gl.inet.

Configure your Gl.inet with the public IP and DNS settings you gave above. Configure the wifi with a wifi password and you are set. The Wifi on the Gl.inet is bridged to the LAN ether port by default. (If you tried to change the Wifi to client mode via the previous instructions, you will have to change back to WAP mode.)