Hello @nirasulanka,
1. Unfortunately, it is not possible to directly edit or add fields to the My Account page as it is a default WooCommerce page and our theme does not have any influence on it. Changes would require extra customization or you could try using a third-party plugin that better meets your requirements.
For more information, please refer to the official WooCommerce documentation here: https://woocommerce.com/document/customize-my-account-for-woocommerce/ and https://stackoverflow.com/questions/47599050/add-a-custom-field-in-woocommerce-edit-account-page.
2. For Social Login setup, please refer to our theme documentation here: https://xstore.helpscoutdocs.com/article/87-facebook-login/ for instructions.
We thank you for your interest in our product.
Best Regards,
8Theme’s Team.