get the pin to unlock my mac

See "How do I unlock my Mac?" in:

https://support.apple.com/HT204756

to see the 6-digit code.

If the solution offered above your post don't solve your problem then you have a different problem. You should start your own thread rather then highjacking this one and fully explain what your problem is and what you have tried so far to solve it.

this is how to set a new pin (be sure to remember this one) - If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

LN

I want to unlock my Mac book Air?