how to bypass factory amp?

ok! been trying to search around and most the pictures are gone from photobucket

i got a 93 with premium sound. i took the amp out from under the seat cuz i think its broke.

i read the grey harness from behind the dash is power. so i dont gotta worry about that?

i ordered this. and a kenwood stereo.
1987-00 Mustang Radio Install Wiring Harness at LRS - Same Day Shipping!

i have no idea what im doing. starting to get a little how it is. but i have a few questions.

how would i hook this up? like bypassing factory amp.

and maybe a link that explains what the plugs on the back of the stereo is. any help would be great. thanks