Add a thumbnail of the trendmap
First, go to the page with the trendmap you want. An example:
Trendmap for eirikso.com

You find the complete list of trendmaps here.

Then click the link: “- Go to code examples for this chart – “

Then open the template for your sidebar. For WordPress 1.5 that is:
/YourWPdirectory/wp-content/themes/YourCurrentTheme/sidebar.php

Insert the code for “Code to add a thumbnail of the trendmap for…” from the code example page.

…or you can insert a badge with a link to the trendmap. Simply insert the “Code to add a trendmap badge with a link to the trendmap for…” from the code example page.