When you have tagged a piece of text, a link or an image, you can untag this later:

  1. Select the text, link or image you tagged (in the main text area, not in the sidebar)
  2. You'll see the tag appear in the top bar, in green bold text
  3. Click the name of the tag
  4. The name of the text will no longer be bold, which means that you untagged succesfully
  5. Save your page