'89 OLDS EIGHTY-EIGHT

I turned off my vehicle and when I went to start him her wouldn't do anything. The lights and all worked but no clicking sound whatsoever. I took the batter in to be tested and tested fine. I cleaned the batter cables and the starter cables, and still nothing. I tried to take the starter off but to no addue no luck. Were are the mounting bolts for the starter located? I am unsure if I am even trying to loosen the right bolts. Very frustrating. Normally am really capable of repairing the vehicles I drive. Please help.