Flip the tablet over such that the screen is facing upwards.

Locate the the 4 small openings on the sides of the tablet.

There should be 2 on the bottom of the tablet, 1 on each side of the tablet viewing it from the front as if you were using it.

Do not confuse the openings with the charging port or the USB ports. The openings will be labelled with an icon of a small fan, the Nabi logo.