[Risolto] Custom Proces

Background of the issue:
I want to use custom prices on my site link nascosto. I am following the documentation at https://wpml.org/documentation/related-projects/woocommerce-multilingual/multi-currency-support-woocommerce/?utm_source=plugin&utm_medium=gui&utm_campaign=wcml#configure-distinct-prices-for-different-currencies.

Symptoms:
The option to put another price is disabled.

Questions:
How can I enable the option to put another price?