At Publishing Targets > Security, you can configure security settings on a group-by-group basis for a given publishing target.

The center Security pane shows the groups that have the ability to publish to the selected publishing target. The Available Groups pane on the right lists groups that have not been enabled to publish to the selected target. To enable a given group to publish to the selected target, drag it from the Available Groups pane to the main security pane. To deny a group access to the selected publishing target, drag the group from the Security pane back to the Available Groups pane.

You can use the search field and the Filter and Clear buttons to find available groups.