Thanks for your reply.
Yes, the j2.5 interface truly much simple than j1.5...but I could not understand how to set it to work on any mobile devise.
My question is when I upload MJ! and it's automatically published(I didn't change any setting at this component), then I found there's a Mobile Menu module has set the "main menu" of my site correctly and published also, since they both were published, and the Mobile Menu has pointed to the right menu that I want to show on mobile, but I still can not see any change on any mobile devise(iphone, andriot, win-mobile...), means my site on mobile still shows the home page as it is in desktop browser.
Should I set any parameter or function in MJ! component to let it work?
If there's any picture could let us know how to set it step by step within j2.5 will be great!
big thank and best regards