Nikon D5500 - Manual (Page 99)

75 More on Photography
The self-timer can be used for self-portraits or group shots that
include the photographer. Before proceeding, mount the
camera on a tripod or place it on a stable, level surface.
1
Press the I (E/#) button.
2
Select E (Self-timer) mode.
Highlight E (Self-timer) and press J.
3
Frame the photograph.
Self-Timer Mode
I (E/#) button