You would need to create a customised version of sidebar.php but do not edit the Twenty Eleven theme. It is the default WordPress theme and having access to an unedited version of the theme is vital when dealing with a range of site issues. Create a child theme for your changes. Or you can download a pre-made Twenty Eleven child theme from here
Oooh boy, that looks a little scary at first glance. But I’ll take my time and try and work through it.
I like how everything associated with WordPress is deemed to be “Very simple”
“Making a child theme is very simple”
I haven’t found much with WordPress to be simple yet!
Thanks for those links. I’ll see what I can do.
Just take it a step a a time and you’ll find that it’s not that scary. Start by uploading the Twenty Eleven child theme I linked to above. Then add a copy of Twenty Eleven ‘s sidebar.php file to your child theme. Now you can edit and change the sidebar template file as much as you want/need.