I asked a question and someone answered, but I want more information. I don't have enough reputation to comment and say I want more info. The only thing I see I could do is edit my post and add my response. But it seems kind if weird to say in the question "Hey you with the first answer, can you be a little clearer?" What am I supposed to do?
There is a threshold but it is not that high. You need 50 reputation to leave comments.
I believe it is easier if you first focus on answering questions that do not need comments. Skip the questions that need more information for now and get a bit of reputation first.
50 reputation can be gained with 5 easy answers. You just got to beat others in answering (both in speed and accuracy).