I understand you would like to increase video memory on your system.
The Intel® HD Graphics 3000 supports up to 1.7GB of shared video memory. This is possible only if you can find settings at BIOS level.
You need to check with your motherboard manufacturer for any option at BIOS through video configuration to enable dynamic video memory or share memory settings.
See below for more information:
If you are on a laptop it's not very likely that you have a setting for specifying the memory to allocate for the integrated graphics. This feature is usually available on desktops, but rarely on laptops. If you need to increase the video memory in order to run a given game I suggest you look for a patch or a configuration setting that lets this game run on Intel HD Graphics instead. The following articles contain some other tips and tricks that will help you get the maximum performance out of your Intel HD Graphics: