dns-o-matic

Hi, I have a registered domain with Namecheap. It is like xyz.net I would like to use DNS-O-Matic as DDNS updater. I have enabled in Namecheap DDNS, it works with the Asus router using Namecheap as DDNS, but now I need to use a router that doesn't have direct support for Namecheap, but...