Depending on the manufacturer and model of your device, locating the SIM slot may vary slightly. New phones all operate in a similar fashion, as shown below. If you have an older phone, you may need to remove the backing to access the SIM. For your exact model, plenty of videos exist on youtube for your convenience.
IMPORTANT: Using the GlobalSIM 360 International Calling Card is very simple, but it is different than traditional phone operation. Sometimes when you make a call, the original connection will be aborted, and you will receive a "call back" instead. "Call Back" means that instead of your call going direct, your phone will ring first. After answering, the system will dial the destination number.