How insert calendar in Photoshop cs5?

Answer 1

Assuming the calendar in question is already a recognized graphic file (TIFF, PSD, JPEG, etc.), then you would use the Place feature to add the file to the document you're working on.

The Place feature is found in the main File menu; File>Place...., then select the graphic you wish to add.

The other way to do it is if the calendar file is open in another document file in Photoshop, by duplicating the layer into the document you wish to put it in.