i CANNOT GET F5 TO SAVE it tells me I cannot at this time ,so when can i save?

2nd I,v tryed to do the owl ,but everytime i get to the pond i lose the trail
of the OWL
i,v tryed over 35 times and still cannot get it ,I find the time is to
shart i play PC by the time I look down to what lader to use it,s
to late ,Iv failed can anyone help I know the programmer is only plays on
xbox.and does not understand how to play PC.