How to setup the Dyndns on the TimeCapsule

I've bought the Dynamic DNS service from DynDNS, and I'd like the host my own Mac mini with this service, so that I can access my server out of home.

I host my home network with TimeCapsule which is Apple's router product.

I refer to the following link to setup DynDNS server succesfully and connect home network from outside:
http://www.dyndns.com/support/kb/apple_airport_with_custom_dns.html