AMD A8-4555M Graphics Question...

Here are my specs (my model number is HP ENVY Sleekbook 6-1129WM):
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 8.1, 64 bit
Processor: AMD A8-4555M APU with Radeon(tm) HD Graphics, AMD64 Family 21 Model 16 Stepping 1
Processor Count: 4
RAM: 7642 Mb
Graphics Card: AMD Radeon HD 7600G, 512 Mb
Hard Drives: C: Total - 278472 MB, Free - 118602 MB; D: Total - 25632 MB, Free - 3013 MB;
Motherboard: Hewlett-Packard, 18DE
Antivirus: Windows Defender, Disabled
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Question:

I'm not sure how to allocate more RAM to the graphics part as there is no option in BIOS on increasing it.