Dear @thamer,
Kindly note that the registration form should be located on the “My Account” page: https://topdstore.com/my-account/.
To enable this functionality, please activate the registration setting by navigating to your WordPress Dashboard > Settings > General, and checking the “Anyone can register” option. For your reference, please see the following screenshot: https://prnt.sc/VLspCxfI6mjF.
Thank you for your attention to this matter.
Best regards,
The 8Theme Team