If you are going to give feedback to a new user a downvote may not be clear, and I would go as far to say, is never clear. Please leave them a comment and explain the site, you can flag as Not an answer for a moderator or higher rep users to clear out the post with a delete and have a comment explain what they have misunderstood.

A good comment to leave might be along the lines of:

> This forum is not like other forums, there is already an answer for
> this question and the way to support it is up voting. The reason you
> cannot upvote is because you have not yet attained the reputation
> required to do so, a rough estimate of both expertise and knowledge of
> the site. Please try to add new answers other places or ask questions
> you have. If you have any confusion about the site, visit the 
> [FAQ\](http://electronics.stackexchange.com/faq)!


I put a space in between FAQ and the link so that you can copy paste and remove it for a working link.