*optional* field in bibliography

Thanks! That does indeed solve it. Although I have to say that I don’t quite understand the general functionality of the field “link adjacent text” yet. What’s it for? What does the linking of text in the reference type have to do with field being “printed” on screen optionally? But anyways. 

More importantly: assume I have a paper with only one page. How do I tell endnote to have output p. if there is a single page and pp. if there are multiple pages? 

PS: I of course did run the template on text–otherwise I could not have reported to problem. I used a modified Chicago style.
PPS: Since you were so helpful with this one, do you have any idea on this by any chance? dash in bibliography // I also attached a screenshot of the reference types. Maybe that helps.