To remove a webpage from a subpage navigation menu you will need to perform the following tasks.
Log in to the Perpetua CMS for your website.
Type <yourdomain.com>/login into your web browser and then enter your Perpetua CMS credentials. <yourdomain.com> will be replaced with the domain of your website.
Go to the parent page for the child page that you want to remove from the navigation menu.
In this example we will be removing "Test Page" from the "About Us" subpage navigation menu. "Test Page" is a child page of "About Us" so we are going to browse to "About Us"
Remove the page from the navigation menu.
To remove the page you can either hide the page or delete it entirely.
Deleting the page.
To delete the page make sure you are looking at the page you want to delete. Then when logged into Perpetua go to "Page Properties" and then click on "Delete This Page".