Hello there! Thanks for supporting the game! Also here are the answers.
1: Rolling equal or higher reduces your Stability by 1 point (or 2 points, at GM's discretion). Since you have 5 points of Stability, rolling a 5 or 6 is a fail. You are safe only in 1-4.
2: There is a newer version of the core rulebook, you can download it now. I corrected some typos. Thanks for the advice.