Tagging a document

Hello,

I'm looking for a way to add the ability to tag something (document) on Vibe before submitting it rather than have to go back to the document then tag it using the 'Tag' tab... Is this possible? Would this be something I would have to do on the back end on the Vibe server or is there something I'm missing when creating a custom form?

Any suggestions/help would be GREATLY appreciated.

Regards,
Ryan