It looks like you have changed your defaultwebpage.cgi to your own. Although this allows you to get a page online in the meantime, you can't really use it for actual websites. defaultwebpage.cgi appears when the domain is not setup, and it displays a page to tell the user that the webmaster has not configured it yet. It used to be cPanel confirming your installation, but it appears you have changed it to your own under construction page.
I will attempt to guide you through the setup of your domain. However, I will struggle since I don't actually own a WHM account (but I do use Kloxo) so I'll try and do it by looking at the official demo. Firstly, you will need to create a new Package. You can do this by clicking on the link on the left handside of WHM that says 'Create a package' underneath the 'Packages' subheading. I can't help you with creating a package, but hopefully it's pretty self-explanatory.
Now that you have created a package, on the left hand side click on Create a New Account underneath the Account Functions heading. On this page, enter your .x10.mx domain in the Domain textbox, and give yourself a username and password you will use to login to cPanel. From the package dropdown, choose the package you just made. You can probably leave the other settings as is. Click the magic Create button at the bottom and then your ready.
You can login to your brand new cPanel at se3c4arab.x10.mx:2082