I assume that Ohio St.-Michigan is the penultimate game being played in Week 14 and the final game is played in week 15. Is the correct?
If so, I'm not sure that you can do anything without the editor. There's a few programming features working against you:
1. Certain games are programmed to be played in certain weeks.
2. Week 15 is only an option on the schedule when there are less than 12 teams in a conference.
3. If you're going from a 12+ conference to less, the pre-programmed rival games will usually stay in Week 14, while the overall schedule adjusts to have a final game in week 15.