Ive done a bit of research on this topic and it seems that the last photo taken in an album becomes the cover photo by default. I remember once before I was able to alter the date on a photo which I wanted to designate as the cover photo and it worked. Unfortunately a decent amount of time has passed and I cannot remeber which steps I took. I have spent the better part of my entire morning figuring out how I was able to adjust the date on that photo in order to get this to work. If anyone could provide some insight on this topic it would be very helpful.