How use usb c with my MacBook Air M1?

It looks like it should work, but to be honest, I don’t understand why it isn’t. Do you have any other USB-C devices to test it with? There are three possibilities: It is broken, or it just for whatever reason doesn’t work with your computer, or that a macOS reinstall could potentially fix things.

Are you running the latest version of macOS? (Apple Menu > About This Mac)

Hello, well firstly, could you send me a link to this ‘Ugreen USB-C’ you talk about, Ugreen make many products with USB-C ports so this isn’t particularly specific.

First, a description of what is "not working" and what is would be very helpful in solving your problem since plugging in the hub by itself does nothing.