What do I do with Mystery Mouse on level 46?

On level 46 Mystery Mouse comes out and highlights a certain letter.  What is this for?  And how do I use Mystery Mouse?  It tells me that he can help me, but you don't give any hints or explanations?

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Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.