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Design and Skin Customization
You should be able to go to your ACP > USERS > Users > Global Config > Site Options; it is a built-in feature for the User module. If you don't see that tab under the Global Config tab, you may need to update your install. ACP > CORE > Marketplace > System Updates.
If you don't need to update, and you still are not seeing that setting, you'll want to send us your admin login to support_at_jamroom_dot_net so we can check it out.