This is your processor: Intel® Celeron® Processor N2830 (1M Cache, up to 2.41 GHz) Specifications
According to the info provided, you have Intel HD Graphics, not Intel HD Graphics 4600. The tool reporting that needs work.
You can find the latest drivers here: Intel® HD Graphics for Intel® Celeron® Processors
Unless your bios allows you the change DEDICATED video memory (DVM), you cannot. However, you may be able to change SYSTEM video memory (SVM). Read post #2 here:
Registry changes are at your own risk.
Regarding the tool you mentioned, I avoid 3rd party tools like the plague.