Basically fowl language towards other players. Hurtful comments and that sorda thing. But do try not to get muted. and because you've been reported so that 10 trimes your account go by by
If you are "permanently" muted, then there is no way to become unmuted. You should have just followed the rules and not gotten muted in the first place. They are very simple rules, and easy to...
The reason you get muted in RuneScape is because if you get reported for offensive language use the Jagex mods/staff mute you for a number of days and you can only use quick chat.
The only method of talking is to use QuickChat. You can use access the QuickChat menu by either clicking the bubble next to your name in the chat window, or by hitting enter.