[Plugin: WordPress Mobile Pack] Change main menu

Hi, i use the FlatOn theme and i have customized the css files so that the website can fit with my preferences. After finishing my website, in mobile version was really terrible.. 😛
with the plugin WordPress Mobile Pack got it working properly but i need to edit the main menu. Currently the main menu is:
GO TO->
my menu
OTHERS->
-Visit Website
-Credits
and i would like to transfer the “my menu” in main menu..

searching for some older issues
([resolved] Use a different menu for Mobile Theme)
, but in Appearance -> Editor -> there is no option “WordPress Mobile (base)” where you select theme. There are only my uploaded themes that i tried to used when i was searching for the propriate theme to edit.
what can i do for changing the menu in mobile?