7 inch MID TABLET rooting problem

hi, im new here and i have a problem.


my android is an android 2.2


i rooted it using z4root and after that i got that super user app.
now my problem is it is not asking for permission either allow or deny.
i tried to install busy box but it didn't ask anything nothing popped up, i tried to install many apps to but nothing popped up.


p.s those apps need to be rooted, the ones that im installing.