Reply to Post Button

I am using the BuddyPress default theme.

I was messing with some codes in a bunch of files and now my guests somehow cannot “reply” to posts. One the home page, the “comments” link on the bottom right works and goes to the post, but from there the same “comments” link remains with no option below to reply. There used to be an AJAX reply button that once clicked, a text form would pop up where members can type a comments and click submit, therein posting the comment below the post. Now it is just blank.

I do not want my guests to have admin access and I prefer their comments to be AJAX, so changing their privileges won’t work. I also made sure my comment thread was checked under Settings->Discussion and it is set to 5. I am assuming that I accidentally deleted the button and AJAX form when I was fooling with code, I just don’t know how to fix it.