Make fields of Billing and Shipping Address Form as required

Questions
1

Hi everyone.

Can anybody give me a little help. How or where can I to do an specific fields as required? I need to define for example: state and country as required.

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Thanks!

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/84952-make-fields-of-billing-and-shipping-address-form-as-required