With Calendar Designer, the Place command is placing the calendar template which includes the grid, dates, and month onto the calendar.
2011 Calendar
For Mac users with Photoshop CS5, these template files file must be located in...
Macintosh HD\Users\Shared\2011 Calendar Templates\
2012 Calendar
For Mac users with Photoshop CS5, these template files file must be located in...
Macintosh HD\Users\Shared\2012 Calendar Templates\