How to add button in the Header?
From your WordPress Dashboard, go to Appearance > Customize > Header & Navigation > Button section.
Add your text in the Button Text field.
Insert the link in the Button Link field to redirect the button to the link.
Click on Publish.
Note: You need to have an Primary Menu to display the header button.
It is shown in the image below:
If you need another header button, it is available in Pro: Header Button Two Overview (Pro)
Updated on: 16/07/2023