Question: How to measure current in a dc circuit?
Option 0: With your multi-meter set to dc current connect the red probe to the positive power supply and the negative probe to the positive terminal of your led, it is the longer lead or the one without a flat side, then wire the negative led terminal of your led to the negative terminal of the power supply.
Option 1: With your multi-meter set to dc current connect the red probe to the positive power supply and the negative probe to the positive terminal of your led, it is the longer lead or the one without a flat side, then wire the negative led terminal of your led to the positive terminal of the power supply.
Answer: 0