This is a known issue on ProtoShare 3.9 that the breadcrumb component isn't easy to select when part of a template. What you can do is open up the page listing, which is collapsed by default, by clicking on the small double arrow icon to the right side of the editor canvas.
The problem is resolved in ProtoShare 5. For any customer who wants to upgrade prior to automatically being moved in the near future, please contact use via this Support Form
and indicate and preferred date.