I just installed the Jing application, however I am not able to sign in to use it.
Recently Screencast.com was updated to include our universal log in system. We had to change a few items on Screencast.com because of the change in authentication including how Jing creates accounts.
After you make the account in Jing, you may have to go to http://Screencast.com and log into the site in the upper right hand corner to initialize your account.
After you have logged into your account and see the library view on the website, you can then open up Jing again and use an existing account to log into the Jing software.