OK, nevermind- I found my answer!
In case anyone else is curious, this is what I did:
-Click Edit >> Output Styles >> Edit Vancouver
-In menu at left, under Citations, click Templates
-Highlight (Bibliography-Number)
-Click on A1 on top of editing window (this looks like an “A” with a superscript “1”)
-Close Vancouver style. When dialogue box asks if you want to save it, say yes. Give style a new name like
“Vancouver Superscript.”
Maybe this will help someone else. Thanks again for helping me out in the past!
~Monica