input number of collections

How to input number/quantity of My collection? Always back to empty collumn after I put number on it.
Any answer will help, thx :-)

Hello,

Be sure the box is not pink colored after entering your number. If pink then delete the minus sign (-) and everything will be ok.
By the way, there is an English forum. You can swap to English or French forum by clicking on the flags at the top banner of every page.

Hope it helps,
J.

I did it, still same, can't put number. I'm online by mobile, should I did it on PC?