Can't edit single occurrence of a series in Outlook

I have a reoccurring meeting that needs to happen at different times/days of the week. I scheduled how many I needed with the plan to edit each occurrence for the specific date/time needed. When I select the event, I choose 'Edit' --->'This event'--->make my modifications and click 'Save'

I get an error message that states 'Event action failed for: Meeting Title' and I click on 'More details' which states 'You're editing this one event in the series. Edit series | Edit this and all following events'

How do I edit just the one event? Or how do I create a reoccurring event with differing dates/times?