In admin > Configuration > Product Listing, set these appropriately:
Display Product Add to Cart Button (0=off; 1=on; 2=on with Qty Box per Product)
Display Multiple Products Qty Box Status and Set Button Location ->set to 0
In admin > Configuration > Product Listing, set these appropriately:
Display Product Add to Cart Button (0=off; 1=on; 2=on with Qty Box per Product)
Display Multiple Products Qty Box Status and Set Button Location ->set to 0