In this video from Rojelab.net, you will learn more about creating hair extensions.
Turn on the device and put the Keratin palettes on the device to melt. Take a few layers of hair, brush them, and remove the excess with scissors. Put the tip of the hair layer inside the device to get enough glue on it and remove the uneven tips afterward. Now use scissors to cut the hair layer into smaller parts from the tip. Now put more Keratin on each part. Next, use your fingers to rub and round the tips.