When something isn't working correctly, you might "fiddle around with" it. Fiddling around with something means trying different things to see what works. Here are some things that you might "fiddle around with":

• a computer program that you don't really know how to use correctly
• a part that's fallen off of your bicycle
• a new music player that your wife can't figure out how to load songs into

When you "fiddle around with" something, it's usually because you don't really know how to fix it well.