recovery key on Macbook air

kiyomi100 Said:

"How can I get the recovery Key on the Macbook air?"

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Go Here: What if I lose my Recovery Key? - Apple Support

You have to create a new one. If you can't, then you don't have Two-Sep Verification enabled.

As it Reads:

1. Go to appleid.apple.com.
2. Sign in with your password and trusted device.
3. In the Sign-In and Security section, click Recovery Key > Change Recovery Key.

Get, as in how to you retrieve it? It is wherever or however you chose to store it, and only you can know that.

Refer to How to generate a recovery key - Apple Support:

"... it's important to keep your recovery key in a safe place."