By default, normal users (non-administrators) need to be in the jira-users group to log in to JIRA. Often, as your JIRA grows, it is not feasible to have everyone in the jira-users group; for example, you might have one group for all internal employees and another group for consultants and contractors. In this case, you will need to grant permission to both the groups so that they can log in to JIRA.
In this recipe, we will be creating a new custom field from the default selection: a single select list custom field.
Proceed with the following steps to grant JIRA access to a group:
The JIRA Users global permission allows users to log in to JIRA. When a user is created in JIRA, he or she will be automatically added to all groups that have this permission, unless the group also has a JIRA Administrator or JIRA System Administrators global permission. It is important to pay attention to what groups you add here so that users will not be automatically added to the groups they don't belong to.