Default Help me how to move apps in Samsung Galaxy Young Duos GT-S6312

Hi i have a samsung galaxy young duos GT-S6312
But in this mobile i can't move app to ext sd
Now
my internal memory only left 163 mb and i want to install more app

my phone is rooted

And i don't know how to enable the move to sd option

or how to increase my internal memory

what to do ???

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