There are several ways you can create an additional site in your Cloud account. When logging into Cloud, you can hit the Create new site
button. This button can be found at the bottom of your screen, below the list of sites you already belong to.
Alternatively, you can create a new site by clicking on the Change site
menu in the upper left corner of the interface and hitting Create new site
from there.
Pick your site name carefully, as this name is used as part of your site URL. While you can change the display name of a site after creation, you cannot change the internal name that is used in the URL. Note that your site name must be unique and may not contain spaces. There is validation to ensure you meet these requirements.