CompleteNOOB,
I'm the forum idiot so don't be horning in on my turf. The wire connector that you have shown requires a tool known as a crimper. It is very similar to a pair of pliers but in places of gripping jaws it has some mating arches that crush metal connector so that it grips on the wire. The type that I use has a tonsil in the middle of upper arch and it embeds the connector into the wire when crushed.
Now if your application dictates that the connector is soldered on then get your heat gun out and soften the plastic insulator so that you side it off. If you don't intend to use the insulator then use a knife and cut it off.
Yep,
I'mClueless