Q: How do I enable a bluetooth connection between my iPhone and my macbook?

You don't. This has never been a feature of iPhone, iPad or iPod.

What is it that you are trying to accomplish?

You can't do that.

Carlwein wrote:

 

At times when I am off grid I would like to move files between my iPhone 6s plus and my Mac Book Pro via bluetooth without resorting to the cloud.

BT file transfer has never been supported in iOS.  See iOS: Supported Bluetooth profiles - Apple Support

This has never been a feature of the iPhone, iPad or iPod.

Sorry

What about Airdrop? It uses Bluetooth, but only to establish a secure wifi network between the 2 devices, not for the actual file transfers. It won't move all content however, so this may not be a solution for your needs.

Share content with AirDrop from your iPhone, iPad, or iPod touch - Apple Support

Yes, it does. Bluetooth pairing, however, is not involved.