Assuming you're referring to the latest version of Confluence, it depends on the Theme. With the Default theme, there's a Space Tools drop down located at the bottom of the sidebar. If the Documentation Theme is in use, you can access Space Administration from the Browse menu on the top nav. Of course, Space Administration will only be available to space administrators.
Hope this helps!
You may refer to the link below for the information about the changes in Confluence 5.2 as the space admin is as well a change.
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