Nikon D5500 - Manual (Page 121)

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Lowering the Built-in Flash
To save power when the flash is not in use,
press it gently downward until the latch
clicks into place.
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The Built-in Flash
For information on the lenses that can be used with the built-in flash,
see page 320. Remove lens hoods to prevent shadows. The flash has a
minimum range of 0.6 m (2 ft) and can not be used in the macro range
of zoom lenses with a macro function.
The shutter release may be briefly disabled to protect the flash after it
has been used for several consecutive shots. The flash can be used
again after a short pause.