Confluence spaces, by default are visible to the general public, but require a logged in use in order to make changes. Confluence provides a few different ways to limit access to either an entire space or specific pages in a space.
Space-Level Permissions
In your Confluence Space, navigate to the tools icon 
on the left side of the screen.
Select Permissions on the top level navigation
Access to a space can be set for either a group or an individual.
Defaults
By default, all TUL staff who use Confluence are part of the confluence-users group.
Limit entire space to specific individuals
If you would like only specific users to be able to view and modify (the "Add" permission) content in a space, click Edit Permission, then click Select All next to the group name.
Anonymous Users
Access to a Confluence space by individuals who are not logged in is governed by this "Anonymous Access" at the bottom of the page. To remove anonymous access, click Edit Permissions and uncheck the permissions or click Select All.
Page-Level Permissions
On the space-level permissions page (above), click Restricted Pages to view which pages in your space have restrictions.
To restrict viewing or editing of a page, navigate to the individual page. You will know that an individual page has restrictions by the lock icon at the top of the page.
Click on the lock icon to view more information.
From this screen, you can modify the page-level permissions. Please note that page permissions are hereditary and are applied to any child pages of the current page.
Page Information
To view information about the page, navigate to the three dot menu in the upper right corner. Then select Page information from the drop-down menu.
This is what you should see.
