Well, there are many different ways. You can reach out to us by DMing us on twitter https://twitter.com/WoWChallenges or you can send an email to Leeta AT WoWChallenges DOT com.
Alternatively, you can try to find Admin and Mods on WoW Challenges Discord: http://discord.wowchallenges.com but to be honest, that’s probably only
a good avenue for quick / simple questions. Longer pieces of feedback are probably better sent by email.