Well that device should be running Android "Marshmallow" so the OS allows the change, but that doesn't mean that the manufacturer didn't restrict the option. Below are the instructions on how to turn a SD card into "Internal" storage rather than the standard "External" storage. If you can do this on the device, then you can run apps from the card. If the manufacturer has made it so you can't, then you can't run apps off your SD card. In such a case the only way to really free up space on the device would be to move the photos, music, videos, etc., which can be moved, over to the card.
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.