Thanks for writing in! Looks like you are referring Topbar area where you can enable Social Media icon from Customize > Header. Kindly provide your URL and clarify a bit more.
Hey there, I’m trying to add a custom buttom in the topbar, next to the social icons, I guess it will need some custom coding but I don’t know in which file I need to add the HTML.
You don’t need to edit any HTML. Just add your HTML to Customize > Header > Topbar Content . Make sure to give your content a class so that you can add some styling with custom CSS. Let us know if you need help to position or styling a bit.