Masjid admin. Your code is the whole of the sign in, so there is nothing else to remember.
A join code gets you the times inside the app. This page needs an admin code.
Everyone who joins sees this name. Changing it centrally changes it on every phone at the next sync.
These are the jama'ah times every phone in the masjid wakes up to.
Follow a nearby masjid and this masjid's azan times become theirs, refreshed every day. Leave it empty and nothing changes: the times above are the whole timetable, as before.
Not following anyone.
A rule per prayer, on top of that azan. Manual keeps the time typed in above. Azan plus minutes moves with the sun (Maghrib plus 2, Isha plus 10 rounded up to the next 5). Fixed is the same clock time all year, like a 05:15 Fajr jama'ah.