Puzzle 3...

Spoiler:


Each letter substitutes another letter. The way I figured it out is that, from whatever the letter is that appears, count 13 letters after it, and whatever letter you end up on is the letter that's supposed to be there. For example, V = I, I = V. N = A, A = N.

Also, you don't really need to decode the entire message, its just there to help you find out how to decode it, I imagine. You just need the last word there, that's got quotation marks around it. That's the password or whatever.