p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.
Here you can find the option for Rounded Stroke. For some weird reason, you won't be able to see this wrench icon there (in Effects Controls Panel) unless you open it via Window > Properties.