AVC 783 DVR: How to watch CCTV from home over internet

[ianfaefife]

Hi,
I recently set up cctv for a boy and he is wanting to watch this over the internet (from home on his laptop) i connected the dvr to his router that he got free from talktalk and i can watch it no problem from pc on network or wireless through network by typing in the ip address. but im not quite sure how to watch from home any help would be great thanks. dvr is avc 783 and he has lost the instructions think it is chinese make thanks in advance