RedHat Linux Space Usage Problem

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http://unix.stackexchange.com – I recently downloaded something on my Redhat Linux computer, and it told me I was out of space. I checked my disk usage, and it says I've used 100% of my folder, but as you can see I still have almost 900Gb available. How can I reallocate some of that space to my user? Here is a screenshot of my disk usage: http://i.imgur.com/o2CzK.png I know this may be a basic question, but I can't find a way to give myself more space. Also, I have root access. Please let me know if anything else is needed. EDIT: output of df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup (HowTos)