I follow the cross stitch Reddit and read a few Reddit post with people wondering what the thing on the right side picture is for. This inspired me to write a tutorial on how to use a needle threader. The silvered colored version in more common that this gold one.
Put the metal loop part of the needle threader through the eye of the needle. This will be a number 26 needle if you are working on one of my patterns.
Put the threads through the metal loop part. For my patterns this will be 2 strands of embroidery floss.
Pull the thread through the eye of the needle using the needle threader. Make sure you hold the part of the metal loop, because it tends to come unhinged when pulling to hard.