Unable to schedule a meeting

I am unable to schedule a meeting (this happened before, but I don't remember how it was resolved as I am 66 and have memory issues).  I schedule the date/time setup (Oct. 8 4:00 p.m.) and then click on SAVE.  When I go back in, it says no meetings are scheduled (although it shows a meeting scheduled for Oct. 2 - and I never scheduled a meeting for Oct. 2).  What do I need to do to fix this issue and be able to schedule meetings again?