You can adjust the privacy settings of your site to limit who can view the contents of your site. To make an adjustment, go to the administrative menu on the left side of the Dashboard page and select the "Settings" and then "Reading" link.
There, you should see the following set of options:
Select the appropriate setting for your needs. Note: If you restrict access to registered users of your site, you will need to have users added to your site. If you are using a WordPress site that was created as a UVaCollab tool, the set of registered users will be the members of your Roster.