How do I change the email address when i set up my macbook to a new email

Lisamorourke wrote:

How do I change the email address when i set up my macbook to a new email?

If you are encountering Activation Lock as might be inferred here, you will need the help of the (current) owner of the Mac:

... Activation Lock for Mac - Apple Support

Here is how Apple expects the owner to do to prepare to transition ownership of a Mac to a new Apple ID and new owner:

… What to do before you sell, give away, or trade in your Mac - Apple Support

The rest including the re-install of macOS, you can do yourself.

If the seller is unavailable and Activation Lock is set, this Mac is indistinguishable from a lost or stolen Mac. You’ll need proof of original purchase showing serial number or legal paperwork and a discussion directly with Apple, or the assistance of the person holding Activation Lock here.

Sounds like you want to edit account information

Change the name of your macOS user account and home folder - Apple Support