How to use portable charger?

I just got this portable iPhone charger thing and I'm stupid and don't know how to recharge the rectangle. Someone help

There should be a USB port on the bottom like an android phone.

What is there to know about using a charger? You plug one end into the phone and the other end into the wall, or the cigarette lighter if it's a car charger. If it doesn't fit you exchange it for one that does.

Your iPhone should have a slot to plug in, and it should fit your charger. So just plug them together. For the other end of your charger, you should plug it to wall socket.

As you know portable chargers are mainly used for charging your mobile devices while you are on the move. Once you charge your portable charger up to 100%, it can charge your mobile battery from 0-100% approx 3 times.
Just make sure that before going out for travel, charge your portable charger completely. And, when your mobile show low battery warning, just plug the cables and join both the devices (mobile and charger). Once your mobile is charged completely, unplug your mobile and switch-off the your portable charger.

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