The Logic v2 and newer has a PMOD connector, which is a standardized way to connect various peripherials.
The 1.x HW revisions do not have PMOD connector.
Pinout is visible from the underside of the board as white labels.
The 5V label is wrong, and it should say
VCC instead - the voltage is configurable, see below.
On the v2.0 HW revision, there are three pinheads to be used to set the voltage on PMOD VCC. They are unfortunatelly without labels, so here are photos of the 3.3 V and 5 V settings: