P780 8GB showing 4GB.. any way to fix ???? topic

HI guys
my first post...
I am having Lenovo P780 8GB... ROW
I wanted to install the Vibe on my phone so I used this patchworkoftips lenovo-vibe-ui-20/3830/
and installed this VIBE 2. by VDT from needrom.com

everything is working amazingly and it looks super cool especially the radio signal icons on the left side and its font I just love it..
but the problem is now I have 4GB memory and I couldn't understand how to get to 8 GB or is there any way to use the unused 4 GB ??

helpppppppp

bau bau

sorry cant post links