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If you don't plan to use the "sense" function, put a tin blob on the solder side at J1 and J2 (see the schematics also).
- Use a regulated power supply and set the current limit to 50-100 mA or something low.
- Connected a voltmeter at the output.
- Turn up the voltage slowly and observe the output and the current consumption. When the LED H1 starts to shine you should have a stable output voltage.
- Add a load to check is the voltage still is stable including some warm-up of the opamp and the voltage reference (a few millivolts).
If you have the preregulator LM337 installed the output voltage should be stable with 4-5 volts more in than set output voltage.