In the previous recipes, we looked at how to manually create new user accounts and invite users to create new accounts. These are the two options JIRA administrators have when your JIRA instance is used internally.
However, if your JIRA is set up to be used by the public, such as a support system, you would want to let your customers to freely sign up for a new account, rather than having them to wait for the administrator to manually create each account.
Proceed with the following steps to enable a public user sign up:
Navigate to Administration | System | General Configuration.
Click on the Edit Settings button.
Set the Mode option to Public and click on Update.