It is a web based ticketing system that allows both users and staff to maintain greater control over their tickets and makes communication and resolution of issues a seamless process.
JIRA automatically creates accounts for UMIACS Account holders. If you have a UMIACS account, you can log in to JIRA using the UMIACS Single Sign On service. Otherwise, when you email JIRA, a ticket is created, and the email address your mail was sent from is added as a participant to the ticket -- this means that if you create a ticket using a non-UMIACS email address, you'll have to login to JIRA using that email address to see the ticket.
If you have a UMIACS account
Simply login to Jira's Customer Portal  and select the UMIACS Single Sign On to login with your UMIACS credentials.
If you do not have a UMIACS account or submitted a ticket with a non-UMIACS address
The first time you use a new address to submit a ticket you will get an automated email containing a link to set a password for the newly-created Jira account. After you have set your full name and password, you can log in with this email address and password at the external user page .