The plug on the esc that looks like a servo connector goes to channel 3, the three wires out go to the motor, you may or may not want to use bullet connectors. That will leave you with two wires a red and a black, they go to the battery. If your motor runs backward reverse any two of the three wires. You will need a connector between the battery and the ESC so you can unplug the system to turn it off, and charge the battery. JST is probably the connector they gave you but not sure.

Good Luck.