HT1343 how to use the options with F10, F11, F11 for turning the sound up or down or mute?

Hi, I'm Hannah. I'm using a Mac. Can you show me how to use the options with F10, F11, F12 for turning the sound up, or down or mute? Thank you very much

Normally simply pressing them should do what you want, F10 to mute; F11 to decrease volume; F12 to increase volume. However, it's possible that you have a box ticked in Keyboard preferences which modifies the behaviour of the keys, requiring you to also hold down the Fn key (bottom left key on the keyboard) to enable the function.
Check System Preferences>Keyboard to makes sure the box indicated in the image isn't ticked.

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