The short version is that you need to "unpublish" the 3 PayPal button pages:
The long version is as follows:
Use the "Content Management Filter" to locate the 3 PayPal pages.
- Main Menu: Content Management >> Content Management Filter
- In the "Show only items where" section click the "Undo" button if there is a previously selected filter.
- Select the "Node" radio button and choose "Page" from the adjoining pull down menu.
- Click the "Filter" button.

Select each PayPal button page and publish/unpublish.
- At the far right on the "Content Management Filter" listing and at the top of the actual button page there is an "Edit" link, click it.
- At the bottom of the "Edit" page for each node is an expandable section titled "Publishing options".
- Open that section and check (or uncheck) the "Published" option.
- Click the "Save" button at the bottom of the node edit page to save the publish/unpublish change.