Transfer a user from one Organization to another (Import Export)

I have a 17 organizations of Dynamic CRM 2011.

I want to create a user in one organization and then import it to the other 16, i am avoiding having to recreate the same user again and again in all these organization.

Please give me clear instructions on how to export/import a user from one organization to another. 

I was using XRMToolBox , as shown bellow, but it does not work.