You have a static page and want to use it as a widget - e.g. to have it appear in the right sidebar of your blog.

1. Create the static page.
   
   
   
2. Go to Widgets → BlockParser Widgets and enable your static page as a BlockParser Widget.
   
   
   
3. Go to Widgets → Manage Widgets.
   Drag the BlockParser Widget of your static page from the Available Widgets section and drop it where you'd like to have it - e.g. the Right bar.
   Hit the Save changes button.
   
   
   
4. Reload your blog and see your static page in the right sidebar.
   
   
   

Done! :)

Bonus: Have you seen that the "Menu" static page is used as BlockParser Widget as well?