Can't set non-recurring holidays?

I have had the Ooma Office for almost a month now and am looking to set up the Virtual Receptionist. I was going to be pro-active and enter the holidays for the rest of the year, but it seems to want to make all dates recurring. How do I set certain dates to be non-recurring?

Thank you,
Don James

I tried this using IE, Firefox, Chrome, seems only setting recurring is available. Don’t think that’s the intention looking at the help blurb to the side (saying can set “one time” or “recurring”).