Cannot resize Ubunto partition

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http://askubuntu.com – Hi I've been using Ubunto for about a month now, and I'm still having difficulties adopting to it. One issue that I've been facing for few weeks now is that the Ubunto partition is running out of space (I setup only 6GB of space for it and now I have less than 300MB available). I tried to follow the instructions which I've found in some threads here, but non worked. http://img248.imageshack.us/img248/3699/screenshotfrom201211051.png I'm trying to add the 3.79GB (sda7) to Ubunto partition (ext4). When I click the right button over ext4, the only options I have are [Unmount, Manage flags, i (HowTos)