futz with (something)
1. slang To engage in aimless recreation or frivolous time-wasting; to fool around. I can't believe we spent the whole day just futzing with the TV.
2. slang To play or tinker with something. Hey, don't futz with the thermostat—it needs to stay at 68 degrees. Grandpa's still futzing with that old radio, but I doubt he'll get it to work again.
futz with
v. Slang To manipulate something without a clear sense of purpose: The child futzed with the toy, and then it broke.