Well it depends on the version of Android the phone is running. Yours should come with "Lollipop". If that is what it is running now, then you can't move apps to the card. That is not an option for that version. Now if you are running "Marshmallow", and the manufacturer hasn't restricted the option of moving apps to the SD card (it happens) then you can use the instructions below.
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...