Finding your WordPress blog id is easy. Go to your blog’s Settings page and look for the “General” tab. There, you will find a “WordPress Blog ID” field. Enter the id into a search engine, and it should come up.
If it doesn’t, you can find the id by going to your blog’s public pages (index.php, wp-login.php, etc.), copying the HTML code for the “About” page, and pasting it into a search engine.