I think Gate usually provides a guide on how to use their products. Look online for documentation.
http://www.gatee.eu/picossr_en.pdf
Ohh, you meant the little wire. I'd suggest applying a bit of solder on the contact first, then while holding the cable melt it again, and ''dip'' the exposed wire end in the hot solder. Should hold, and be clean. Be sure to be quick, or the heat transfer will melt the insulation in the cable.