your supply may be capable of 5V, and a gazillion mA
Look at the top right - X1 is barrel connector, D1 is reverse polarity protection diode, U1 is the onboard regulator.The voltage before the diode should be ~7.5V, the voltage after the diode ~6.5V, and the regulator will output 5V.
stick it in barrel jack connector
DO NOT connect you LED Anodes to power them
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