The first time you log in to the end user interface as an administrator, you'll be prompted to get the site going. After adding a little information about yourself, setting a visual theme and basic structure for your community, you can invite others to join. All of the settings you make here are things you can change later.
When you first arrive, you'll see a "Welcome back" page. Click Personalize your site to get started.
Click Continue to see a preview of your profile. At the preview, you'll get a chance to go back and change things. If you've got something that works, click continue to site theming.
Starting a structure for content is one of the most important things you'll do to get started. Most space lists tend to reflect interests or structure of the communities they serve. The spaces for a company site, for example, might be organized to reflect the organization of the company itself. A public site, on the other hand, might reflect areas of interest.
It's a good idea to have thought through your space list before creating actual spaces. Once people start adding content, changing things might confuse your users or slow your site's adoption. If you've got a list of the spaces you think you'll want, pick the two that are most likely to help get things started. For example, you could create two spaces that are sure to provoke people to read and add content.
Click Continue to go on to where you can invite people to join.