To retitle the Lessons Page, click on the Settings icon (i.e. gear icon).
On an existing Lessons page, you may also add more top-level pages (i.e. pages which display in the site Tool Menu) by selecting the Add More Pages option from the More Tools drop-down menu.
Notice that you also have the option to add several pages at once by indicating the Number of pages desired below the title. The number of each new page will replace the number in the title provided.
You also have the option to Make new pages copies of the current page by checking the box provided.