Need help with stationary bicycle

I have a stationary bicycle we got used from a friend who has lost the instructions (if they ever had them.) The machine is a DP Fit For Life stationary bicycle with a workout computer. Unfortunately, the computer does not work -- doesn't even power up. I think it needs batteries, but I can't figure out how to open the computer to replace the batteries and the company that made the bicycle has gone out of business years ago.
Anyone here know how to replace the batteries?
 
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