2 open your psp & drag the folder "cxmb" to the root of your memorystick
3 copy the custom thems to the folder:"\PSP\THEME\" of your memory stick
4 copy the line "ms0:/cxmb/cxmb.prx 1" to the vsh.txt in your seplugins directonary, if vsh.txt doesn't exist create one with notepad
5 unconnect your psp, select a theme & have fun ^^
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NOTE:
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Some of the themes might turn off your PSP if you try to start the web browser, it´s normal
you need CFW (customfirmware) to run cxmb, most of the themes are tested & should work