Robin

Backup your website, disable your plugins or if you have access to your ftp rename your plugins folder to plugins-old

Your header file has
<link rel="canonical" href="index.html" />
you might need to check this first
I think this is being added through your SEO Yoast plugin

so basically in simple terms
you make a child theme if you want to custom style or add your new functions on your WordPress theme

Structure —
You have a parent theme (could be even twentyten)
in the same directory (wp-content/themes) you make your own theme folder (your child theme)
so how does this child theme knows who is the parent
that is where you add your style.css (and add the code i showed above)
Most of the options in the code above are self explanatory
Just a thing to keep in mind
Template : (this would be name of your parent theme folder)

Child theme styles and functions would be called before the parent themes so you can over ride any default styling of your parent theme style

Hi
you have to create your own child theme,
create a folder using ftp
wp-contents/themes/(your-child-theme-folder)
and add style.css
and add this on top of your style.css

/*
Theme Name:     your-child-theme-name
Theme URI:      http://example.com/
Description:    Child theme for the Twenty Eleven theme
Author:         Your Name
Author URI:     http://example.com/about/
Template:       twentyeleven
Version:        0.1.0
*/
@import url("../twentyeleven/style.css");

Template is the theme your are going to make child of

follow this codex for more in -depth understanding
http://codex.wordpress.org/Child_Themes

cheers 🙂

Hi Agnes
this plugin should solve your problem

http://www.filmtraveler.com/2008/11/18/wordpress-plugin-shorten-link-text/

and if you would like to use your theme please contact the theme development team or post a job to fix the issue at

http://jobs.wordpress.net/

This is not a wordpress files this is your theme