Place a towel on a flat surface. remove the back of the watch using a minurature screwdriver to remove the screws. Use a pair of tweezer to remover the spring holding in the battery. remove the old battery and replace it with a new one. Reeplace the spring to hold in the battery and then replace the back.
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Pl. click on this link and follow the instructions on the last page.. http://ftp.casio.co.jp/pub/world_manual/wat/en/qw2550.pdf
To install a new battery in a Casio watch, remove the back plate. Remove the small battery and insert a new one that is exactly the same size and the old one.