There are two ways to charge the iPhone back, one is to connect the iPhone to the power socket by connecting the power adapter and data cable, and the other is to charge the back through the wireless charger.
If you choose to use a data cable and power adapter to charge, first plug the data cable into the iPhone's Lightning port, then connect the other end to the power adapter, and finally plug the power adapter into the power outlet to start charging.
If you choose wireless charging, simply place your iPhone on a compatible wireless charger to start charging. During the charging process, the iPhone screen will display a charging icon, and when the charging is complete, there will be a prompt tone. In order to protect battery life, it is recommended to use Apple's original charger and data cable for back charging.