You need administrator rights in Jira to perform the tasks on this page.
Before you can begin using the Checklist app, you must add the Checklist custom field to Jira.
To add the Checklist custom field:
Go to Administration > Issues.
In the sidebar, go to Fields > Custom fields.
Click Add custom field.
In the window that opens, select the Checklist field type and click Next.
Enter a name and description for the new Checklist custom field and click Create.
On the Associate field [name] to screens page that automatically displays, select the screens on which the new Checklist custom field should appear and click Update.
The new Checklist custom field will now be listed on the Fields > Custom fields page, which can be accessed through the sidebar. To begin configuring its various settings, proceed to Configuring the Checklist custom field.