I have checked with Bravenet about his new message format, and the complaints are rolling into them about it. If you are having difficulty starting a new thread, beneath the picture of M&S, there is a window. On the left it says "Start a New Thread." Click that to begin a new topic.
I also checked to see if there is a way to enlarge the font. No luck.
I apologize for this, but with a free service, I'm somewhat at their mercy.