So i have a dell laptop with 4gb of RAM,Intel HD graphics 4000 and 1696 mb of available graphics memory but i get only 64 mb of dedicated video memory. People asked me to increase it's size using the BIOS SETUP but in my bios, i can't find the option as they said. So i wanted to know if theres another way to increase this or another way to make the option available in the Bios
You are on a laptop so as @PandaBear270 has said, chances are that you do not have a setting in BIOS for specifying the memory to allocate for Intel HD Graphics. This doesn't mean that you can't get a little bit more performance out of your Intel HD Graphics though. Check out the following articles to see what you can do in this regard:
doesnt really matter, it doesnt actually have any "dedicated" video memory, it uses system memory still. it just sets aside a 64mb portion of system memory as "dedicated memory". it is also dynamic and will increase that 64mb depending on its needs.