To add a web page to a menu, first create your web page. To do so, please read the topic "How do I create a web page ?"
How to Get to the Menus List?
2. Click on the "Menus (Navigation)" link on the left menu
3. You will be taken to the "Menus List" where you can view menus' details
Adding Web Page to Menus
3. Click on "Add new link" to create a new empty line
4. Enter the name of the link as you want it to appear on your website, select "Page" and then select the page you want to add
5. Once you're done, click on the "Save" button at the bottom right