fiddle (about/around) with sth
— Phrasal Verb with fiddle
/ˈfɪdl/ verb [T] UK informal
MOVE THINGS › to touch or move things with your fingers because you are nervous or bored: Stop fiddling with your hair!
MAKE CHANGES › to make small changes to something to try to make it work: He fiddled with the wires to get the radio working again.