If you don't mind my saying so, the .jpg calendar image you uploaded is too compressed to allow enlarging to the size specified. Artifacting is already evident on the small scale image and becomes even more so when enlarged.
Just about any picture publishing program and most paint programs have at least one or more calendar templates available. All you need do is navigate to the program folder and load it up. From there you can add photos, change text, etc. fairly easily.
It helps if you know your program ahead of time but a calendar project is an easy, fun way to learn.
Adding your own photo is easy but understand when you enlarge a bitmapped image (which is what all scanned images are) it becomes pixelated at best, unless it was originally scanned in at a very high dpi (dot per inch) to begin with.
As an alternative, you can also scan the picture larger than you need it, then reduce it to the desired size in your paint program.
Load both images (calendar template from your program) and File>Import your scanned photo into the calendar image.
Just my 2 cents. Anybody got change?