Arduino access page

How do I access a page Arduino (webpage) of 30 in 30 seconds? I would like him from accessing the page http://username:password@members.dyndns.org/nic/update?hostname=yourhostname&myip=ipaddress

This code will send a request and display the response every 30 seconds. http://playground.arduino.cc/Code/WebClient It should be easy enough to modify to your needs.