Jira can operate in two modes, public and private. In private mode, only the administrator can create new user accounts. For example, you can use the private mode for Jira instances that are used by internal engineering teams to track their projects.

Public mode allows anyone to sign up for new accounts. The new accounts that are created will have normal user permissions, so they will be able to start using Jira immediately:

As shown in the preceding screenshot, you can sign up for a new account.