For older versions (self-hosted), since they don't work with the Sidebar Widgets from Automattic above, you will need to add it straight to the sidebar template. This requires a little understanding of HTML editing. Follow the steps below (see screenshot):

1. Login to your WP admin, click on "Presentation", "Theme Editor", then "Sidebar Template".

2. Looking at the HTML code of your sidebar, you will see a lot of <ul> and <li> tags. Each tag basically displays one of the items listing on the sidebar. You would want to create one like that for your MyBlogLog widget. So first, go grab your MyBlogLog widget code, enclose it with <li> and </li> tags, pick a spot and paste the code there (see screenshot).

3. Click the "Update File" button to save. That's all!