Network Global Configuration

Click “Network” in the left column, then “Global Configuration”.

If you do not know, and cannot find, the IP addresses for your ISP's DNS servers, you can use Cloudflare's Public DNS servers. Use 1.1.1.1 for the primary DNS server, and 1.0.0.1 for the secondary.

The server can now find the Primary and Secondary DNS servers. This means web addresses (URLs) can now be resolved to IP addresses.