Step 1. First of all, you need to find [Settings] in the mobile desktop and click to enter
Step 2. Next we can find the [battery] option from the page
Step 3. Then we need to turn on the switch on the right side of [wireless reverse charging]
Step 4. Finally, we just need to open the device that needs to be charged and put it on the back of the phone to start charging
To open the Samsung note20u reverse charging, you need to pull down the shortcut menu at the top of the screen, find the wireless power sharing icon, and click the icon to stick the phone that needs reverse charging and the phone that outputs power back to back to charge.