I'd like to ask more about his answer but I cannot comment on his answer. I also see that I cannot contact him via his profile.
How would I go about doing that?
I recommend that you to set out and earn 50 rep then see How do comment @replies work?.
To earn the additional 28 rep you could:
Perhaps ask a question, putting in detail of your query and make reference to the answer in question. Be sure to be detailed in your question, particularly with details on what exactly you are trying to do, what you have done so far and any and all details of any research on that topic that relate to the question.
There are two approaches:
Gain the reputation necessary to comment.
You can do this by posting good questions and answers, or by suggesting good edits to posts which need improvement.
Post a new question with all of the detail needed to explain your request.
This question should not be directed at the original answerer (who may or may not be available) but can include a link to that answer. However, your question should provide enough information to stand on its own, whether or not the original answer exists.
Fundamentally, you don't contact people. There's no "private message" facility in the Stack Exchange site. You can earn enough rep to leave a comment on a question/answer or you can start your own question, but there's no guarantee that the person you're trying to contact will see or reply to these. On the other hand someone else who can give you an equally good solution/explanation to whatever query you have could step up to the plate instead.