Hello, Nirmalya,
1/ Please note that we are not the developers of the plugin in question. We kindly recommend contacting the plugin’s support team directly, as the functionality and behavior of the plugin are beyond the scope of our expertise or control.
We appreciate your understanding in this matter.
2/ https://www.8theme.com/documentation/xstore/woocommerce/enabling-user-registration-on-website/
Best Regards,
8Theme’s Team