how to use wirless charger in iphone 11

See this, How to wirelessly charge your iPhone - Apple Support The charger needs to be a Qi certified.

You need a wireless charging pad to place your iPhone upon. Once you put your iPhone on the wireless charging pad then your iPhone will charge. The wireless charging pad is NOT included during the iPhone's initial purchase. It is a separate purchase. Google search for a "Wireless Charging pad for iPhone".

Axel F.