How do you delete a single song off an ipod?

I have an apple ipod (touch) and I used to use LimeWire, I didn't know it was illegal at the time so when one of my friend's told me it was I quickly deleted it off my computer. I only put a few song's on my ipod and now I use Itunes. I would like to delete one song off of it because it isn't the real version. can someonle pease tell me how!?