Yep, what Julie said. The reason everyone is asked to start just one thread a day, which can have as many questions in it as you want, is to ensure that everyone's questions get seen. If 70 people all posted three or four questions a day, a potential emergency, like a possible hypo or DKA, could be buried under all those separate threads. You can update the subject line as many times as you want if you add questions.
By asking for one thread a day per poster, we're ensuring fairness for everyone who posts in the ISG forums. People getting buried by multiple threads by one poster isn't fair.