can save proudect as it asking me to set The value of attribute "how_many_ebay" must be set
this attribute is not in my list how can i remove it from my dater bass and were about is it to fix this problem
That's not a default attribute so it depends on your implementation what could happen if yo uremove the attribute.
You can manually delete your attribute on Stores -> Attributes -> Product.
Please make a backup before delete the attribute.