Hey guys, really simple issue here...

I've just installed Kali 2.0 on a USB and followed http://docs.kali.org/downloading/kal...sb-persistence to add persistence. I ran openvas-setup to setup OpenVAS but am running out of disk space. I see that it's filling up root during the setup then it eventually fails due to not enough disk space (only 872m). I'm using a 16gb usb with over 8gb of unallocated space, how do I resize root to add space? Looking around GParted it wasn't clear to me how to do this. Sorry if this has already been answered or if this question is inappropriate for this forum.

Thanks.