DYNDNS with Arduino and 3G Shield

Hi everyone!

I have an account in dyndns.com, and now i want to use it with my arduino 3G/GSM Shield..

I'm using an Arduino Mega 2560 and this 3G/GSM Shield based on SIM5216E (http://www.elecfreaks.com/estore/3g-shield.html).

I don't know how to initiate this project.. Because i don't know how to connect this Shield with 3G to dyndns.com and then log in with my account, refresh my IP if it necessary and logout..

I want to do this to set a dynamic IP to my Shield and then connect to it with only one IP.

Thanks anybody for your time!