Help With Stereo

I want to hook up subs to my car and put in a deck. Me and my friend looked at the stereo and cannot find any way to pop out the stock stereo. Please help, we have checked everywhere. I have a 1999 Solara SLEv6

The trim that surrounds the head unit will come off if you use a flat head screwdriver to pry around gently to release the clips. Once you've removed the trim, there are four bolts, remove them, and pull the unit out, disconnect the connections and there you go.