Q: Which of these apps do you own?

A: SmartDay for Mac (only)

Okay, you are only using SmartDay for Mac but you do sync iCal with your other devices. We strongly recommend you get SmartDay for iPhone and/or SmartPad for iPad, so that you can keep your integrated Events, Tasks and Notes in sync on all of your devices. If you do get either of those, just run through this sync wizard one more time before setting up.  In the meantime, you can easily sync SmartDay for Mac with mySmartDay.com; this will keep SmartDay in sync on all of your Macs (home, office, school, second home, yacht, helicopter, wherever). It will also enable you to see your SmartDay data on any computer browser, including a PC.

To set up sync for the first time: go to Settings and verify your free mySmartDay account.  If you do not already have an account, you can create one from Settings -> Synchronization.

Remember: before you sync with iCal for the first time, change any duplicated calendar names in Calendar/Reminders.