Vekkit’s dynamo lamp adapter is very easy to use.
Just plug in the universal connector¹ of your lamp and click the switch. The adapter’s indicator will light up green and your lamp will be on.
In case of a failure, the adapter’s light will be red. This means that there was a short circuit and the protection turned on. In such case you should turn off the adapter’s switch and then on again. If the light is still red, check your lamp or use another one.
You can also use the adapter’s USB port to charge your devices.
¹ If your lamp does not have a universal connector, you can buy the connector separately (for example, here) and attach it to the lamp’s cable.