I think its a little buried on the app, so I'm going to try & explain where to find the times.
On MDE, log-in so it knows who you are & which resort you're staying at. On my Android, there's a 3 hash line menu in the lower right corner, click on it. Then you'll see another menu on the screen, click on 'resort hotel'. Then another menu appears, click on 'bus times'.
Sounds like a lot & as others have posted, its not a perfect system, but it sure beats not having the info. It also only shows your resort, so if your returning from parks or visiting another resort, it won't help. I used it to know when to leave my room each morning.
Also, VERY important, you are staying at FW & I've not stayed there since bus times started appearing on the app. But, I'm going to assume the app will not show internal bus times, which run continuously, but are still a timing factor. If I were at my site & saw a bus leaving in 20min on the app, I would assume I would not make that one, but the next. You might wait 15 min. on the internal bus, then have to wait again on the external bus.