Meaning of “fiddle (about/around) with sth” - Learner’s Dictionary

fiddle (about/around) with sth

phrasal verb with fiddle uk us /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.

(Definition of “fiddle (about/around) with sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)