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Hi gotee,
Getting multiple themes ready to be used is a 4 stage process:
(1) Upload theme to /themes directory
(2) Goto your XOOPS admin control panel, select preferences then general settings. Under the Selectable themes selection box, make sure all the themes you want to be available for selection are highlighted.
(3) Goto the blocks admin section and make sure you have the themes block set to visable.
(4) Now if you go back to your home page you should be able to select your theme from the theme block.