Discussions.apple.com not allowing me to respond to any questions people submitted

Also, some of the questions you're trying to respond to may be old enough that they've been locked. Such should be noted in the thread if that's the case.

Why not, what happens when you try?

At level 1 and 4 points, I would guess you are a very new member.

Posting limits are rather severe at first. This is mostly to discourage spammers. The longer you're around, the more they'll relax.