Nikon D5500 - Manual (Page 77)

53 “Point-and-Shoot” Modes ( i and j)
Deleting Unwanted Movies
Display the movie you wish to delete
(movies are indicated by
1 icons). Note
that movies can not be recovered once
deleted.
Press O; a confirmation dialog will be
displayed.
Press the O button again to delete the
movie.
K button
O button