Thank you for the reply. Unfortunately, I've tried what you suggested and all it gave me was the code plus what I wanted to say. e.g. the output of the textbox would be "\n<Reg> Yo, what's up!". I've tried other commands provided in the code but it seems like my RPG Maker can't seem to initialize the script.
Also, I've tried your version of the message script (the ATS formatting) and I got the same problem as well.
Update: Ok, this is kinda freaky. I tried the commands again and its working which was weird because a few hours ago, it wasn't. Anyway, thanks for your help. Really appreciate the fast reply!