Q: When I try to enter the numbers that my macbook tell me to so I can have my messages go onto my mac from my phone, it won't let me allow it to

Hi AveryCabot,

I understand you are having trouble setting up the Continuity feature so that you can send messages from your Mac.  What OS X version do you have on your MacBook Air?  Continuity requires OS X Yosemite or later.  Have you tried restarting your Mac and your iPhone?Take a look at the resource below for more information:

Use Continuity to connect your iPhone, iPad, iPod touch, and Mac

Continuity lets you seamlessly move between your iOS devices and your Mac, or use them together.

To use Continuity, check that your iOS device or Mac meets the system requirements for this feature.

SMS

With Continuity, all the SMS and MMS text messages that you send and receive on your iPhone can also appear on your Mac, iPad, and iPod touch. You can also reply to your contacts from whichever device is closest to you, including your iPad or Mac.

You can start a conversation in the Messages app or click a phone number in Safari, Contacts, or Calendar.

Set up SMS and MMS with Continuity

1. You need iOS 8 or later on your iOS devices and OS X Yosemite or later on your Mac.
2. Sign in to iMessage with the same Apple ID on your iPhone, your other iOS devices, and your Mac.
3. On your iPhone, go to Settings > Messages > Send & Receive. Add a check to both your phone number and email address. Then go to Settings > Messages > Text Message Forwarding and enable the device or devices that you want to forward messages to.
4. Look for a code on the Mac, iPad, or iPod touch that you enabled. Then enter this verification code on your iPhone.

Take care,