By clicking on the "Edit" link corresponding to the page name in the Website
Manager, a new page loads requesting you to choose between the options: either
edit the selected page, retaining the existing page type, or change the existing
page to a different page type.
By selecting the former you will be taken to the next page which will allow you to
edit the page depending on the type of page chosen to edit, i.e. if a text page is
chosen to edit then the page loads with an editor in order to edit the page or if a
shop page is chosen for editing then the shop page features load for editing. This
will vary as per the page type that is chosen to edit.
In case the latter is chosen the following page loads allowing you to change the
page type from the existing type for a different page type of your choice.