Hope it's not too late.....I have a 94 prizm and have had other cars as well but when it comes to removing the back seat, it's pretty much the same for most cars. Obviously your seats don't fold down cuz you woulda tried that already.....all you have to do is.....start with the bottom seat first. Start on one end and slide your hand underneath and lift directly up. The seat should have 2 or 3 snap ons holding it in place. (if you have never removed the seats before, it might feel like you're gonna break the seat. Trust me you wont, keep lifting). Once you have removed the bottom seat, you might notice some bolts holding down the back seat. Nothing your rachet set can't handle. You might have 2-3 bolts also. Once you remove the back seat there might be a plastic divider (94 prizm has one, yours might not). There's nothing holding the divider and therefore easy to remove. After that....VIOLA!! You're in your trunk.
good luck!