It would be best if you send a ticket to our support. I also don't see a license for that site here, https://www.socialengine.com/php-site/verify . Make sure you set your domain for your license.
In case you do not want to get support, try this tutorial https://support.socialengine.com/php/customer/portal/articles/1642532-admin-panel---settings->-signup-process and make sure the first two sign up steps are in the correct location as they are not supposed to be moved or it breaks the sign up process.