I know this sounds dumb, but did you try googling the manual again online? Some of those companies post them up to help ya out.
The "springy washer" is what's called a lock washer.
My guess since you have four, rather large bolts, they go on each of the four corners for main support and pull the bed together. Look around for four similar holes that can support those bolts. I am assuming they will be screwing in otherwise you will need a nut to secure them on the other side.
Also LOL @ this is your fault dude while he laughs at you.