Erasing MacBook air

Follow the step in Apple Support Document: What to do before you sell, give away, or trade in your Mac - Apple Support

dutchievargr85 Said:

"disabled: im trying to convert my (everything ) from my phone i just smashed on accident to a different iphone and it hasnt been turned on for a while, it turned on. and it says on the screen that i have to connect to itunes in order to disable it????"

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Try Turing Off Lost Mode:

Did you have Find My enabled on this iPhone that "hasnt been turned on for a while"? If so, then some time in the past, you likely you'd not locate it and choose to erase it. So, perform as instated here:

1. Go Here: Use Lost Mode in Find My iPhone on iCloud.com - Apple Support
2. Scroll to: Turn off Lost Mode on an iPhone, iPad, iPod touch, or Apple Watch
3. Proceed from there as necessary.

please read the question. It is about anMBA, not an iPhone.