Hi,

If you would like to set up a subdomain for your site... you should be able to just login to your registrar and add a CNAME record where the Name is  "gallery" and Value being arp.photostockplus.com. 

The Name could be anything you want. that will be the sub domain so  in this example it will be gallery.andrewryback.com. Please let me know once you have made the change and if you decide to use another name as we need to configure it on our end after you do that. 

* Please be aware it can take up to 72 hours to propagate so best not to point to that link from your site for at least that long and after we do the update on our end.