most backs come off 2 ways, look for notches all around the back if u see them u need a watch tool to replace might as well get it done some at a stop. if u dont see them a watch knife (dull thin knife) what u use, look for a lip and use the knife to lift the back
I hope you have not pried the back of your watch yet ... Your watch is powered by light, right?
Please start here: http://www.citizenwatch.com/ select your area, select technical assistance, review the FAQ, then contact the company for the best help you will ever get. They have pulled me from the fire two times.