Q #1)To get to the speakers you have to remove the backseat.
How to Remove rear cushion:
1. Pull cushion release tabs right underneath cushion and remove cushion
Removal rear seat back:
1. Remove small nut on each side of bottom
2. Remove large nut on each side of bottom also holds seat buckles
3. Top is just held in by hooks. Pull bottom off of mounting bolts and lift to remove
The package tray then needs to be pulled up slightly and then it should be able to pull out. You can get to your speakers now.
Q #2)does the car have a cd changer? if so you can buy an easy plug and play unit to convert the cd changer plug to an aux plug for your ipod.