You should only reset the plug if it will not pair with your Smart Home Hub.
Here are the directions for factory reset.
1）Keep the Wireless Smart Plug plugged in the wall outlet.
2）Hold the power button and count for 8-15 seconds then release it.
3）You should see the blue indicator LED blink 5 times and hear a clicking noise. After that, the blue indicator LED will flash slowly, which indicates a factory reset is done successfully. From here, try to re-add it to your hub.
Tip: If the Wireless Smart Plug doesn’t respond to reset, please manually click the power button to turn it on, and then perform a reset.