depending if it is positive sink or negative sink, you apply a common, again either + or -, and each segment is connected to one of the pins extruding from the bottom. by applying the opposite polarity to the desired pin. I suggest using a resistor inline with each pin to prevent burning up the led. about a 330 ohm will do. Dont apply more than 5 volts to the led display or you will blow the led.
Other answers:
Use the correct voltage and a current limiting resistor.
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