Head pins are long, thin piece of wire with a “head”, a flattened piece of metal bigger than the diamter of the wire that acts as a stop to beads on the wire. The opposite end of the head pins is flush cut, not sharp as with straight pins used in sewing. If you are designing a pair of earring, wholesale head pins are a must.

1. Step by step using head pins
Head pins are long, thin piece of wire with a “head”, a flattened
piece of metal bigger than the diamter of the wire that acts as a
stop to beads on the wire. The opposite end of the head pins is
flush cut, not sharp as with straight pins used in sewing. If you
are designing a pair of earring, wholesale head pins are a must.
1 Gather your materials together.
2 Thread some beads onto the head pins. Some beads may
need their holes widened to fit onto the pin.
3Use the wire cutter and cut off excess head pin. Leaving the
material about 1/2 inch left of the pin.
4 Use the tip of your round nose pliers bend the top head pins
material about 90 degrees.
5 Use the thicker part of your round nosed pliers to grasp the
end pin near the top bead and roll the head pins into a loop.
You may have to finish the loop using the fine tip of the pliers.
6 Attach the formed loop to the jump ring, earring loop or post.
7 For the second earring, repeat steps one through seven.
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Source from:

2. http://www.newfashionbox.com/7-steps-teach-you-how-to-use
-head-pins/