Too complicated, do not waste your time…

Dear @momo-fr,
we are so sorry to read that the plugin is not up to your expectations and you find it complicated to use it.
Checking the documentation (https://docs.yithemes.com/yith-woocommerce-product-add-ons/category/free-version-settings/) did not help?
And whatever change you would like to suggest, we would be happy to consider it for the next plugin releases.
Also, feel free to contact on the support page (https://wordpress.org/support/plugin/yith-woocommerce-product-add-ons/), if you need any help from our side, we’ll be glad to help you.