Anyone with a %, @, &, or ~ by their name can unmute you. Click on their name and select PM. It's as simple as that!
Certain rules, like not using hashtags, are not explicitly defined, so new players may need to hang around a bit to learn what is and isn't acceptable in the chat. Above all, just show respect for other users and the staff. Follow any instructions from staff, and you should be good from now on! :)