I'll need to know which one is causing it before I can help you.
You can disable your addons from within the game. Log out to your character selection screen. There's an addon button in the bottom-left corner, I believe. Disable them one by one until the text goes away.
From what you're describing, it sounds like Carbonite's quest log. Try opening your world map (M) and right-clicking anywhere. Select 'Options' from the drop-down menu. Select 'Quest' from the left menu. There might be some options there that can help you.
Mind you, I can't log in and verify and all of this is based off what I've read on the internet, so it might not work.
____________________________Please "talk up" if your comprehension white-shifts. I will use simple-happy language-words to help you understand.