You are trying to register a site with a URL that was previously used by a registered site. We've sent an email to this previously registered site administrator. This administrator will have the choice to delete the previous registration record from the hub. If he/she decide to do it, then you will be able to register your site. Note: Usually you should be this administrator, but this step is required to avoid hacking. Thank you.
Hello Amr. Please can you try again to register and if you have problems, reply to the email from email@example.com ? We did receive your email on Saturday and have just replied this morning (UK Monday morning). Thanks