install and run apps on a jail-broken kindle pw

I jail-broke my kindle paperwhite second generation (k5) version 5.4.2.1 serial number d490. and got the expected message: *** jailbroken ***

then i installed mkk… (kindlit or kual whatever it's called).

update: correction
MKK

now how do i install and run active-content/applications? i tried one, but i have no clue how to run it.

my kindle acts just like before i jail-broke it!