Hello, PureInStudio,
1/ File path: et-core-plugin/app/models/customizer/functions.php
2/ Function name: et_b_account_link
3/ Hooks we have inside registration tab of Off-canvas: woocommerce_register_form_start, woocommerce_register_form, woocommerce_register_form_end ( https://prnt.sc/Sae1q8MApyte )
Note: keep in mind that making changes directly in plugin or parent theme will be lost after the next update. It is much better to use child-theme for such reasons with adding custom code to hooks, filters.
Kind Regards,
8theme team