here how u do it
1. put the correct cxmb and seplugins file into the root of the mms and the theme into the PSP/THEME folder
2. completely turn off ur psp and then enter the recovery menu (hold r triiger while turning it back on
3. then scroll down to plugins and enabled cxmb.prx then exit the recovery menu
4. go to theme settings and there u go
p.s. if u really cant do it email me and i give u detailed instructions