monkey with (something)
To tinker, fiddle, or play with something. Hey, don't monkey with the thermostat—it needs to stay at 68 degrees. Grandpa's been monkeying with that old radio all day, but I doubt he'll get it to work again. I wish I hadn't started monkeying with the settings on my computer. It's all messed up now!
monkey with someone/something
verbSee mess with someone/something