Technika Webcam won't show me to my contacts?

I purchased a Technika Webcam some time ago from Tesco. I can get a picture on my laptop, but my Windows Live Messenger contacts aare unable to see me through it (although I can see them on their webcams).
I am told I need to configure my we bcam with MSN, but I cannot see any way to do it on Windows Live site, nor on MSN, nor Microsoft. Please help me, someone