How to get pictures from my computer off of my iPhone?

I have picture folders on my computer that got synced onto my iPhone and I can't delete them from the phone? I don't know how to get rid of them? Is there a way without resetting my phone?

You plug your phone into your phone charger take off the cube that plugs into the wall then a thing should pop. It should a folder with pictures in it click it. And there you go.