One nitpick. It is confusing that all your options are named "disable" and "allow" but your instructions say "if you set this control, it will disable...". So the control is "set" when it says "disabled"? It is also against convention in the sense that your options are negative-positive (disable-allow) when the convention is positive-negative (yes-no, set-unset, block-unblock, etc).
Personally, I would change the controls to "block" and "unblock", and the instructions to something like "set this to block to disable and hide... ". In the very least, I would change them to "enable" and "disable", in that order.
Edit: just wanted to add that after completing the whole sign-up, I found your overall style clear, concise and organic. You did get a lot of things "just right". Great job.