All you have to do is go into the bios, do this by pressing F2 on boot up, when in the bios you need to look for "shared memory" or "graphics memory"
once you have chosen the shared memory you want save settings and exit by pressing F10, the pc will restart and the shared memory will be increased

regards

You cannot increase your onboard graphics memory by sharing your RAM the graphics memory is inbuilt with the motherboard and hence canot be changed....
I FOUND THIS  this might answer your query so you cannot manually change the Memory
Graphics memory is shared with system memory. Graphics memory usage can vary from 8 – 64MB depending on the amount of system memory installed and system load. 16MB is pre-allocated for graphics use at system boot time. Additional memory is allocated for graphics using Intel's Dynamic Video Memory Technology (DVMT) to balance the optimum amount of memory between graphics and other system use. With a 128MB system, graphics memory usage will be 8MB -32MB depending on system load. With 256MB or more, graphics memory usage will be 16MB - 64MB depending on system l

Can we double our graphic memory by sharing.

Guys what happens if i turn the shared memory to zero cause i need to have 1 gb of ram and i got only 896 mb

Sys_no_graphics