Get the code from the back of your watch and try going to the casio site for the manual. http://world.casio.com/wat/download/en/manual/ I was reminded of this by Noggins posts No if I could only figure out how to change the battery
You can get the battery removal instructions for the same watch from here....
Code # 1174
Use this page to download a copy of CASIO watch manuals in PDF format.
To download a PDF file, enter the four-digit (or three-digit) module number marked on the back cover of your watch.
Usually answered in minutes!