Something not behaving as you expect, or not sure how to do something? Start here.
Whatever the problem, these resolve a good share of reports:
Bobclass needs one to load and to save.
Check the App Store or Google Play for a newer version, and see which version you are running in .
If a change was made on another device, give the calendar a moment to catch up and then refresh before assuming it did not save.
If Bobclass simply does not do the thing you need yet, the Roadmap is worth a look before you write. It may already be there.