Well you can't move apps to the SD card to run from there unless the phone is running at least Android "Marshmallow" and as long as the manufacturer hasn't restricted this option on that phone. If you have, or can upgrade to, "Marshmallow" then you can try the following to make the change. If the options given don't work on your device (even if running "Marshmallow") then the manufacturer didn't allow it on it.
How to turn external SD card into internal storage on "Marshmallow".
NOTE: Please be sure you start with a blank SD card. It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device).
1. Go to device “Settings”, then select “Storage”.
2. Select your "SD Card", then tap the “three-dot menu“ (top-right), now select “Settings” from in there.
3. Now select “Format as internal”, and then “Erase & Format”.
4. Your SD Card will now be formatted as internal storage.
5. Reboot your phone.
NOTE: If you don't reboot the phone, many things may not work correctly, so make sure you do.
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