What's the passcode?

Question

One morning, as you wake up, you feel something on your face: It's a letter. As you take it off your face to read it, You fall off your bed. Uurrrgh, you say and stand up. The letter says: &$t |* }p|t Hmmm. Seems angry. Meet me at 8th and main st. behind the post office in half an hour. Be there. From Yout Ried. Ok, you think.

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Once you arrive, you head into a room and the door slams shut. You try it but it's locked. On the floor you see a "clue".

On the wall you read:

Say the code and escape. You have 3 tries.

Just beneath that you read:

wco ard_q'r uigv wywqwxx wwv kmill, z xvhqigx. rvczym, _h_l nrz. ohlnmv lq: smlvvg_

Good Luck!

HINT 1

The angry message isn't really angry...

HINT 2

The rulebook for Kandoodle might be of help...

HINT 3

What you can decrypt from the clue will fill the blank spaces on the message on the wall.

HINT 4

If you can't figure out what the letter means, look up rot13 cyrptii and fiddle with settings.

Answer 1

Using Hint 4, the angry letter translates into -

Use My Name, the letter was from Yout Ried, so maybe use that name. Use it where though, not sure.

Using Hint 2, the clue translates to-

IAFH , these are the actual letters written there, according to the rule book.

so the writing in the wall is -

"wco ardiq'r uigv wywqwxx wwv kmill, z xvhqigx. rvczym, ahfl nrz. ohlnmv lq: smlvvgh."
Which using youtried as key translates into:
you haven't gone outside for hours, i presume. anyway, good job. answer is: essence.
[done with vigenere cipher of variant Beaufort ]

Finally the passcode is:

Essence