I had to cut the seal so I could fit it around the flange. And - for the record - I am the biggest dork ever. As I am typing this, I just realized that the white paper part of the sure seal peels off. I kept it on... without realizing it peels off!!! Oh well, now that I figured that out, it seems way more "normal". I did have to cut down the paper tape on my actual flange so the sure seal covers the whole thing. Is that the norm as well?
Thanks again to everyone's advice. I actually had to change it today because I was playing basketball outside and the sweat caused the whole thing to come nearly completely off! So hopefully this works so the next time I decide to play basketball or go running, I don't have to worry about it.
I'll keep you all posted - and again- Thanks a ton for all the advice!