Changing Availability from number to In/Out of stock?

Hi, i'm fairly new to open cart. I somehow managed to change my availability from In Stock/Out of Stock to the number that is available. Can someone please help me change it back to In/Out of stock?

Thanks so much!

Hi, it could be in admin of your store, go to system/settings then edit your store
Click the Option tab and scroll down to STOCK and set display stock back to NO