1/ Sorry, but your request is a bit unclear to me. Please provide some screenshots or videos for a better understanding.
As I can see, you disable buttons by this custom CSS code https://gyazo.com/2bc32bfe7e92c6cc11948370137d21e1 https://prnt.sc/7Fo2T_kEEPB6
2/ The registration form comes from WooCommerce plugin, read this article – https://woocommerce.com/document/configuring-woocommerce-settings/#accounts-and-privacy-settings and contact support of WC to get further assistance.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.