Welcome to WebmasterWorld, pshaik.
I'm not familiar with popshop but it sounds like there is only one template area for you to modify title, description and other meta information rather than on each page being developed. If they are not providing support and the software is really that bad you really only have a couple of choices. First, I would probably get away from that software. Otherwise you are just going to have to modify it extensively to get the end result your desire.