Default [Q] How do I set the default install location to External SD Card with root?

Hi im new here, this is my first post but iv read threw a few threads before. I just recently rooted my phone so I could change the default install location of apps to my external sd card but of the things I tried none worked, not sure if I did them right or they just dont work for me. I was wondering if anyone could help me with this thanks.

Also I have a LG Optimus F3 from MetroPCS