There are many easy to follow guides online on how to use GParted. You should Google for one, to find one that seems clear to you.
Here's a general introduction on [http://www.mepisguidesyoutube.com/Mepis-6/Install/gparted/gparted-set-partition.html Here's onewatch?v=vdWkdrnNGRg YouTube] that looks simple. Just use ext3 or ext4 instead of fat32 in you follow that tutorial. If you have a drive > 2.0 TB, there is an in-depth guide below (that may be outdated). Instead, it is possible to use GParted with the following steps:* select the correct drive in the dropdown on the top right of GParted* click Device > Create Partition Table... > Advanced > (Choose 'gpt')* then create your partition as normally instructed** I use /ext4** add an appropriate label
Note that gparted supports GUID-partitioned drives, however, these directions and script do not support it at the moment.