Nikon D5500 - B: Exposure; B1: EV Steps for Exposure Cntrl; B2: ISO Display; C: Timers;Ae Lock

252 A Custom Settings: Fine-Tuning Camera Settings
Select the increments used when making adjustments to shutter
speed, aperture, exposure and flash compensation, and
bracketing.
Select On to display ISO sensitivity in the viewfinder in place of
the number of exposures remaining.
If On is selected, exposure will lock when the shutter-release
button is pressed halfway.
b: Exposure
b1: EV Steps for Exposure Cntrl
G button ➜ A Custom Settings menu
b2: ISO Display
G button ➜ A Custom Settings menu
c: Timers/AE Lock
c1: Shutter-Release Button AE-L
G button ➜ A Custom Settings menu