Well, technically, that is in English, but what it's saying is that you replace every instance of BLANK_SIDEBOX in all of the files of the mod (including file names) to whatever you want to call the second sidebox. You can use your text editor's Replace function.

I have a site with eight Blank Sideboxes, and they're named box1, box2, etc.


You can insert HTML content (including images) in one of two places:

In includes/languages/english/extra_definitions/blank_sidebox_defines.php where it says, um: Replace this text with your HTML content.

or in includes/templates/YOUR_TEMPLATE/sideboxes/tpl_blank_sidebox.php where it says 'You can include text ...'

I usually use the first place.