To add a previously created page to the website:
Go to "Edit Main Main Menu & Footer" on admin panel.
Here, you will find different menu options on Header, Footer and various ”sub links” under them. Select the header/footer under which you want the page to be added.
Click the option Add sub link under the selected header/footer. The following menu will pop up.
Name: Text entered here will get reflected on the navigation menu of the website.
Link: In this field choose the option “Page”.
A drop down list will appear with the list of pages which are already created.
Select the page which you want and click Save Changes
Alternatively, you can choose the option "URL" and insert url of any page if you'd like the users to be redirected to an external site.
Visibility: You can choose one among the options i.e All visitors, Verified Users, or Hidden to set the access to this navigation.
Once this is done, click the Save Changes option, on the bottom-right corner to ensure that these changes get reflected onto the main page.