How to connect DVR thru Internet (works fine in local network)?

[Pirate]

Hi guru, i have panacom DVR camera and i want to view it via internet so that i can see what's happening inside my store where ever i am. I have already tried it using local network and i made it. I set the DVR IP address as 192.168.1.138 with a subnet mask 255.255.255.0 my TP-Link router has IP address 192.168.1.1 and subnet mask of 255.255.255.0 I can view my camera using my itouch, PC or laptop that is connected locally. But how can I view my camera using the internet? I have already account in dyndns.com but I don't know how to set it up. please guide me on how to do this over the internet.

Another thing, i read from the manual that it can only be access thru Internet Explorer. Itouch doesn't have any Internet Explorer and that would be my another problem.