Hi Jlb,
First step will be to find the skin files themselves. They will be located in the Portals/[Portal]/Skins subdirectory off of your DNN website directory, where [Portal] will be _default (as in /Portals/_default/Skins) if the skin is installed for all portals, or the portalId (as in /Portals/0/Skins) if it's installed for a specific portal. The skin you're wanting to change will be in a subdirectory off of here, the name of which should be recognizable. Back these files up somewhere.
You will need to open each of the files with either .htm or .ascx extensions, one by one, using a text editor (notepad is fine).
Within those files, you will need to look for the Privacy and Terms skinobject. For .htm files, this will look like [TERMS] and [PRIVACY]. In the .ascx files, it will appear as <dnn:terms runat="server" ... /> and <dnn:privacy runat="server" ... />. In place of the elipsis, there may be one or more additional attributes (e.g.; id="dnnPrivacy", etc). Remove these skinobjects.
Save your files, and you should be good to go. Note that if you have any additional small changes you wish to make to the skins, these files are the place in which to do so.
Good luck!