Change Page Title
All the Site Editor's pages have the Build a Free Website title displayed next to favicons in browser tabs by default:
To change the Title of the Page:
- Click PAGES in the left-hand sidebar of the Site Editor:

- Hover over the name of the page which title you would like to change and click the Settings button that appears to the right of it:

- Enter the Title of the page into the TITLE field:
The Title of the page on the live website will change once you publish the site:
Change the Titles of the rest of the pages in Page Settings of the Site Editor: