Cannot edit calendar created in Word 2007

I'm using Office 2011 Mac and I'm unable to edit a calendar that was created in Word 2007 from its Templates.
For example, I try to edit information in the box for the 9th day of the month. Either I cannot edit (click) in that field, or the cursor will be placed elsewhere (above the calendar).

Any ideas?

Did you copy and paste the calendar from the original document (Windows Word 2007) to Word 2011 or did you just open the entire document with Word 2011?

I opened the document in Word 2011.