Have problems navigating on your bike! (3,4)
I believe the answer is:
get lost
I believe this is a double definition.
'have problems navigating' is the first definition.
'on your bike' is the second definition.
(both are rude ways of telling someone to go away)
(Other definitions for get lost that I've seen before include "Clear off!" , "On your way" , "Begone" , "without the map?" , "stop interfering" .)