Adding a New Page
On the left hand panel of the screen, click on pages and then click + Add Page
Select the page you want to add and name it.
Edit the new page as needed.
New Page: Use this for all your normal pages.
CMS Page: These are for blogs, listings etc.
404 Page: Custom error page.

Deleting a New Page
Find the page on the left side of the editor.
Click the three dots (•••) next to it.
Select Delete Page.

To Note: