You need a caseback opening tool. Check the interent for the tool and videos to show you how it is done. Or take it to a jewler or one of those kiosks at the mall. Battereis plus will also change watch battereis.
Ok,thanks I took it to a jewelry store and they said they did not have the tools to do it. I was wondering if there was a special kind of opener since there is no spot to pry it open just round circles without notches for a tool to fit into.Thanks