I'm making some assumptions based on your question. "I signed on two days ago" refers to signing on a new installation of C5 on a hosting server (Concrete5.org is a resource for your new site, not the home)?
From your new site: you'll find a log-in link at the bottom of the home page /OR just type in your browsers navigation windowhttp://www.MySite.com/index.php/login... (substituting "mysite.com" with your website URL).
Log in with the user name and password you created when setting up your site. You will now be directed to either the dashboard or the home page of your site that will display a link to your dashboard in the upper right.
Hope this helps you :)
Arvixe Web Hosting / Concrete5 Community Liaison |