The GParted way really is the simplest. Can you tell us what exactly you find confusing? Perhaps we can clear it up for you.

EDIT: If you really want to try the fdisk way, try stripping the bit after the last '/' in the URL. You will get more to choose from than you can shake an fdisk at

(Hint: until-linux 2.13 was phased out. Look for a newer version but expect dependency issues (no, I have not tried it). Hence the recommended GParted way.)