Critics Browser => Questions

Now regarding Critics Browser, I have some questions.

1) After some reading I understood why you have a manifesto class in some classes, BUT I do not understand what I should write in #rejectClasses and in #rejectRules

2) When I used Critics Browser, when showing the results, there is a button with Save Critics (Pharo 2.0 - but it is the same as in Pharo 3.0).  

When I clicked, the message says that this action will modify my manifesto classes. Choosing YES, I checked but there are no new manifest classes or even the ones that already exist, have not changed. Am I missing something in the process?

Cheers,

Gabi