"Yourdomain.com" stands for the domain name that you paid for at Network Solutions, Registrars.com, etc. For this Q&A forum, "yourdomain.com" is "openacs.org". At Photo.net, it's "www.photo.net". You need to replace occurrences of yourdomain, yourserver, yourservername, whatever with the values specific to your machine, your AOLserver server name, your ACS installation, etc. You have to figure out what these values are and edit the appropriate files.