Right now, AnnuCal's planning year follows the calendar year - it runs from January to December and always starts in January.
So if you're trying to set up a year that runs from September to September (for a school or academic year), or from another month for a fiscal or financial year, that isn't possible yet - the year currently always begins in January.
Choosing a different start month is something we're actively working on and will be adding soon. Once it's available, you'll be able to start your planning year in any month.