[ubuntu] Running low on disk space. How do I increase memory?

view story

http://ubuntuforums.org – Until recently, I did not realize that that root and home folders were located in different partitions. When I installed Ubuntu, it asked me to resize the partition it was creating. So me, thinking I wanted the most space for my storage, slid the divider to give the partition that was shown on the right, only 6gb. Turns out that that is probably the home folder. Now I'm getting notifications that say I'm running low on space. How can I fix this? Will I have to reinstall my OS or just resize it? When I tried booting from a live USB, my computer wouldn't boot from it. it only showed the copyr (Hardware)