It should already be partitioned which makes formatting easy. Gparted is a very powerful tool full of a lot of options, way more than the regular Windows formatter, so it isn't exactly "idiot proof" to turn a phrase. That being said, it shouldn't be something to be afraid of, just follow these steps. There's quite a few of them because, as I said, lots of options and power. You don't want all those extra things, you just need these simple things, so I'll do my best to walk you through it.
Put the gparted PND on a card other than the one you want to format.
Run the gparted PND, enter your password, select your card in the drop down in the upper right corner (the left card is /dev/mmcblk0, the right card is /dev/mmcblk1), tap on the partition you want to format to select it. There should be only one, you'll understand when you see the screen. There may be a second labeled "unallocated", just ignore it and choose the big one.
In the menu bar, choose Partition->unmount. This prevents the system from accidentally reading or writing to the card while you're in the process of formatting it. Next choose Partion->Format->Fat32. That sets the command to prepare for formatting. Finally choose Edit->Apply. We have to explicitly apply because we don't want to make a mistake: it gives you a chance to review what you're doing.
The last step is optional: choose Partion->Label, and give that newly formatted card a name. Choose Edit->Apply again to make the label permanent. Eject the card and it should be good to go wherever.
I will say this again: there is nothing to be afraid of. Even if you completely botch the procedure the worst that will happen is the data on that card is gone, which is the end result of everything going right anyway. You can't accidentally format a card that is in use, so the card with the gparted.pnd file is completely safe, and no matter how many times you screw up you can keep retrying until you get it right.
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