how to use; usage method; way of using
Refers to the method or manner of using something, often in instructions or descriptions.
Please tell me how to use this app.
利用方法は説明書に書いてあります。
The usage instructions are written in the manual.
The staff explained how to use the machine.
I don't really understand how to use this app.
Please check how to use the library system before using it.