You would need to go into "Settings" and then "Apps". Next go to either "Downloaded" or "All". Scroll until you find the app you are wanting to move. Tap the app and then you should see a button for the option to move it to the phone's storage. Tap that button and then follow the prompts it gives you until it is done.
How was the app moved to the SD card? Was it just installed and then 'moved' over to the card, or was the SD card changed to be "Internal" storage first?
How was the app moved to the SD card? Was it just installed and then 'moved' over to the card, or was the SD card changed to be "Internal" storage first?