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I believe your question is related to the original thread you have opened here: http://www.jotform.com/answers/796883
If I understand you correctly, you would like to label your forms to make it more organize, currently, the only way is to apply folders on them as mentioned in this guide: https://www.jotform.com/help/204-How-to-Add-or-Group-your-Forms-into-Folders
The other way to add tags on your form is directly putting them on your form's title. Something like "Facebook.com - Contact Us".
With that, when you sort the forms in alphabetical order, you'll have the forms listed on a more organize way. Although, I'm not sure if you prefer to have the website name on the form's actual title.
You can always change the page title of the form found under the "Preferences" setting:
The page title is the one that will show up in your browser's tab. I hope that gives you an idea.