I don't think you can change the pi value on your calculator. However, what you can do is store 3.14 in the memory and instead of using the pi key, recall the number from the memory key.
How to use the various memory keys is outlined in the manual.
Good luck,
Paul
http://support.casio.com/storage/en/manual/pdf/EN/004/fx-300ES_PLUS_EN.pdf
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