Hi, firstly congratulations on owning a piece of "Virtual real estate". How to use it. Well if you purchased your domain through the WA domain registration then it will be pointing to the hosting package that you got with your premium membership and from there just go to the website tab on the left sitebar, click on your siterubix.com site and click transfer to transfer your siterubix site to your new domain (That is your new site) from now on this is where you will be editing your site and adding posts to it.
Hope you have a lot of luck with your site and remember we are all here to help you

Congrats Violina. You have taken the first step towards creating your own brand!

Please check the following training to proceed further: Move On Over, My Brand Has Arrived GeeEss

You may follow me at:
https://plus.google.com/u/0/114182445725551044807
https://in.pinterest.com/iamgautamseth/
https://www.facebook.com/Easy-Practical-Tips-2467980343217067/
https://www.facebook.com/lightlybrowse/
https://www.facebook.com/urbansimba/

Assuming the domain is hosted or pointed here you can start using it right away.

If you have a site already built here using the siterubix.com domain you can move it to your new domain (assuming the new domain is for that site). To do this go to Websites > Site Manger and then click on the Move button for the existing site. You can then choose the To a domain I own option and select your domain from the pull-down menu.

If not, then you can start building a new site on the new domain by going to Websites > Site Builder and building a site for a domain you already own.

Hello Violina, congratulations on getting your first domain.
Have you started with the training, if not please do. All the steps about creating content are explained in the training and you get some tasks to fulfill once done with a topic. It is the best way to learn and build your website for a beginner.