To install LinkWithin Widget on Blogger, just follow the steps below.
1. Go to LinkWithin.
2. Click Install Widget to open Blogger in a new window, and follow the steps below in that window. Please login if necessary.
3. Select a blog if you have more than one, then click on Add Widget.
4. (Optional) For better performance, Drag and Drop the LinkWithin box under the "Blog Posts" box.
5. Click on Save.
And you're done! The widget should now appear on your blog.