You can only directly contact another user under certain circumstances.

Right now, as you are a 1 rep user, you can't, unless you asked a question or left an answer and someone else commented on it then you can "ping" them with @ followed by their user name. For example to ping me you would write @markkirby in your comment and I would receive a notification about your comment or I would write @dannorris to ping you.

Once you have [the privilege to comment anywhere][1] (requires 50 rep) there are a few other ways to make contact using the same @ method above.

 - If they posted a question or an answer, you can just comment below
   the post and the author will be notified.
 - If someone else leaves a comment below a question or answer or is the
   last person to edit a question or answer, shown by their user card,
   centred, below the post.
 - The only other way to [contact a user is in chat][2], you can ping any
   user who left a message in chat for a limited time (24 hours?).

These are, for most users, the only way to directly contact someone on the site, please understand, this is not a social network and "chatting" is frowned upon (outside of chat of course), so the ways to contact someone are limited to only post interactions.

Some exceptions do exist, a mod can contact anyone, any time and some users will leave e-mail or social network details in their profiles, so it is worth a look if you really want to contact someone. Please also respect the fact that some users simply do not wish to be contacted off site.

This might seem a bit unfair to a new user but the [limitations exist for a reason][3], these posts may help you to earn the 50 rep:

 - https://meta.askubuntu.com/questions/257/how-does-ask-ubuntu-work
 - https://meta.askubuntu.com/questions/1209/how-do-i-quickly-gain-reputation
 - https://meta.askubuntu.com/questions/13564/reputation-how-do-i-get-the-minimum-necessary-points-in-askubuntu-to-get-starte

I also recommend you [take the tour][4] and check out [the help pages][5] to get a better understanding of how this site works.


  [1]: https://askubuntu.com/help/privileges
  [2]: https://chat.stackexchange.com/?tab=site&host=askubuntu.com
  [3]: https://meta.askubuntu.com/questions/716/why-are-you-only-allowed-to-comment-with-50-rep
  [4]: https://askubuntu.com/tour
  [5]: https://askubuntu.com/help