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A seven segment display is most always only 7 leds (or 8 with punktuation mark).

One leg is common as ground on all of them.

the other 7 or 8 legs are power connections to the internal leds.

If you plan on using your display on 5 volt, then you need to put a resistor of approx 100 to 120 Ohm in series with each power connection.

For testing purposes as in finding out which leg gives light where, I suggest putting only one resistor to the ground leg.

The ground leg is easiest identifyable by looking underneath the display. The leg that seems to have the most connections is ground.

Note:

There are also displays where all positive leads are connected and you need to apply ground to 7 or 8 pins in order to light them all up.

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