Remove the back cover.
On some watches, the cover will pry off using a very small flat-bladed screwdriver or will have screws holding the cover on. On other brands the entire cover will unscrew. Examine the edge of the back cover. If there is one small depression along the edge of the cover then the cover will pry off. If there are screws present, the cover will lift off after the screws are removed. If the cover has a raised edge with flat edges opposite one another then the cover will unscrew.
SOURCE: how do you change a battery on a columbia cl-7269
Use the notches on the back and unscrew the cover.
SOURCE: i can't open the back
To be honest, I would send back to Columbia. Water resistant watches are not only tricky, but you risk losing the warranty on your watch as well.
I would go to link and follow instructions:
http://www.columbia.com/FAQ-Details/CustomerService_FAQ_QuestionDetail,default,pg.html?rnurl=/app/answers/detail/a_id/417/session/L3NpZC9JRmxoZVk3aw==
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