The breadcrumb trail, as on other pages, is created automatically. The page name in this comes from the 'Title' field of the custom page.

In some cases, you will want to nest content, and have the breadcrumb trail indicate this. To do this, you can select another custom page from the 'Parent Page' control. For example, you might want the breadcrumb trail for a particular page to appear like this:

Home > Services > Repairs

I this case, you'd have to first create a page called 'Services'. You can then create 'Repairs' and select 'Services' as the parent page.