fiddle around
verb1
With "with" To toy or play (with something) in an idle, fidgety, aimless or unstructured way; to mess around (with); to muck around (with).
- Stop fiddling around with those matches before you set the place on fire.
2
With "with" To tinker (with): to make small adjustments or improvements (to something), especially in an experimental or unskilled manner.
- I've been fiddling around all morning, trying to get this old lawnmower to work.