[newbie] Adding Desktop themes

[Marcia]

Dear All, When I had Linux Mandrake 7.0 I loved to download the desktop
themes from Tucows or www.kde.org and then I would add them to the
thememanager in the control center so easily. Now I have Linux Mandrake
7.2 and I cannot figure out how to put these themes I downloaded into
the theme choices menu of KDE control center. Could someone tell me how?
Thank you very much. Marcia