I want to change the swap partition to another partition. Is there a gui that can make this process easier so I don't have to do things like manually editing files?
This is in case you don't find a GUI method, you will find the terminal method quite flexible and easy. Run the following commands:
Then update /etc/fstab. Change the line containing "/dev/hda3" to "/dev/hda4".
Here is the Ubuntu page on Swap FAQ. Also note (from that page):