Default Help moving apps to sd card Lg optimus l9

I need help moving my apps sd card i only have 300mb on my internal and i have a 16 gb on my external
i can't see the Move to sd card button in settings apps . help asap

heres my phone info
LG optimus P769 (rooted)

Android Version:
4.1.2

Baseband Version:
L6260_MODEN_SIC_01.1305.00

Kernel Version:
3.0.31

Software version:
P76920h

sorry I'm nooby with this