You can use this Technorati Tag Generator to automatically create the HTML code for the different tags you want to apply to your post.
After you've finished posting and have added tags to your post, you must notify Technorati that you've updated your blog. You do this by going to Technorati's Ping Form and typing the URL of your blog in the input box. Technorati will then crawl your blog and add your new post to its index. You can see my Technorati tags for this post here:
Technorati Tags: Marketing, Internet Marketing, Blogging