Minimal quantity as default quantity

[lagenceapsides]

Hello All.

I have modify prestashop for each time a client add product , the product is add by minimal quantity.

But if they press + - on product it isn't work with minimal quantity and if a client do a manual grab it not work.

So 2 questions:

Have anybody know how block manual input ?

Have anybody know how transform ine the product page the + - add of one item on a minimal quantity less or more ?

Regards.