Please use the blue “Copy Link” button on your Title Details page to provide members with a link to the book so that they can request or wish for it. This link is not the same as a widget, which would give pre-approved access to anyone clicking the link. If you do want to give pre-approved access to a title with a link, here is some more information on how to use the widget.
For a private title, you can copy and paste the url that appears in the Manage Availability page, under the Private / Not Available in 'Find Titles' section.