Privacy Statement and Terms of User are the skin objects are used ctl=Terms in url. When we pass control key with ctl in querystring dnn skin controller  wiill load control are removes all other controls and apply admin levle skin for this page

you can do one thing, create new tab for Terms of Use and use normal hyperlink in skin and give url newly created tab's url to that hyperlink so your skin will remain intact

Leo TechnoSoft Pvt.Ltd

http://www.leosys.in

terms of use and Privacy statement are included into Skin by  using [Terms] and [Privacy] skin objects. Both skin objects inject text (or precisely, an HTML fragment) from resource files in the appropriate language in a full size module control in a new page, applying portal admin skin. 

If you want to overcome the design restrictions, you can instead create your own portal page, put an HTML module on it with appropriate text inside and replace skin tokens with  fix links to your custom pages.