Hello, To have button on the left of your hamburger menu for mobile, you will have to use Header Builder plugin, and customize your header for mobile there.
I dont want to build the header form scratch.I just want to add some HTML to the exisitng header. Surely there must be an easy way to do this. Again, I am happy to edit PHP files.
Then I am not able to help you at this point because the Header Builder is the only way to achive that, and we do not provide support with PHP files modifications.
Comments
To have button on the left of your hamburger menu for mobile, you will have to use Header Builder plugin, and customize your header for mobile there.
You can read more about Header Builder from the following link
https://support.muffingroup.com/documentation/header-builder/
or from this video tutorail
https://support.muffingroup.com/video-tutorials/how-to-build-a-custom-header/
Thanks
Best regards