Guild Wars 2

Where should I post my feedback to the game, and how should it be formulated, so that it won’t accidently be deleted?

In effect, what are the rules it should abide by?

Use the relevant forum that your feedback relates to.
Outline your feedback constructively and keep it simple and to the point. Theres no need to write a thesis on the subject.
Dont use profanity or start namecalling/throwing around abuse.
Keep it all on topic and write it in a way that would attract more constructive replies and therefore turn it into a constructive discussion.