Is this the site?
This one ?
Still no joy ?
Call 1-855-242-2876 or use their "Live Chat" feature;https://www.comcastsupport.com/ChatEntry/Protected.aspx , or go to your local CC service center about this.
You can also contact Comcast Irma;
or Comcast Zach;
http://forums.comcast.com/t5/notes/privatenotespage/tab/compose/note-to-user-id/5931719 via a private message to request it.
@Iceey95 wrote: when I go to this cite to receive my new modem its says this cite is not working
Is http://www.xfinity.com/equipmentupdate the site you're looking for? How about https://www.xfinity.com/support/articles/update-your-xfinity-equipment-online?