Those are female spade connectors. They crimp on to the end on the wire. Some wire strippers can crimp these connectors or you can buy one fairly cheaply that will. You can find them at places like Home Depot, Lowes, etc by the electrical supplies. The insulated ones are color coded. They use red, blue and yellow and each color works with different gauges of wire. You will need the red ones for 22-18 gauge wire and blue for 16-14 gauge wire.
