Make sure you have a wireless (Qi) charging card receiver. I find LEAPCOVER very handy. It's available just for Rs.350 to 500 on Amazon.
Remember to read the product review. Don't go for the cheapest without reading review, some people says it got damaged in one day
You need to buy a wireless charger. Explore the best iPhone 7/7 Plus wireless chargers.
Step #1. Next, you will have to plug in the included lightning cable of the wireless charging card receiver. Then, you need to fold it over the back of your iPhone.
Step #3. Up next, you just need to place your device perfectly on the wireless charging pad to start charging.
There is another way of charging your iPhone 7 wirelessly. Simply buy a wireless charging case for your device. Install the case on your smartphone and then perfectly place it on the wireless charging pad to get juiced up comfortably.