How to set Web Access & OpenDNS

I want to have web access to my router outside of my local area network (Web Access from WAN) . But I am not sure how to set everything up. I use OpenDNS to block p2p/filesharing, I also use DNS-O-Matic to notify OpenDNS about the dynamic IP changes of my router.

Now I need a Hostname, but don't know which service to use and how to configure it so that it works with OpenDNS and DNS-O-Matic. I tried ASUS DDNS (...

How to set Web Access & OpenDNS