Add a button to header

I’d like to have my call to action (promo) button at the top of the page as well. I am curious if there is a way to add a custom button to my header next to the phone number. I figured out how to add instagram but adding a button where there aren’t any already isn’t as easy. I know this may take some coding which I am fine with. Thanks for your help.

Here is my website:
eboniharris.com