Commenting

Okay. I'm probably the biggest n00b here for posting this, but do i have to have a certain number of posts in the forums in order to comment on videos and such? I was looking for the "Comment" button, but I couldn't find it, so I was wondering if there was a specific way to comment or if I needed to be a member for a certain amount of time, first...Any guidance is welcome and thanks in advance ^_^"