Thank you Scribu, for your kind answer!
The truth is that ordinarily, I would have known how to proceed. But in this particular theme (Atahualpa) there a set of Options which allow you to show a specific icon and link to Feedburner in the Header, just by inputing your Feedburner ID. But that link is to Feedburner in English.
I am given the option to hide the Feedburner icon/link in the header, and I can always set up a form/link to Feedburner via Widgets. I would, however, like to make use of the optional header icon and link to Feedburner, if only I could figure out how to bypass the Theme’s Options pre-setting.
Thank you once again.