You need administrator rights in Jira to perform the tasks on this page.
To add the Checklist Read-Only Proxy custom field to Jira:
Go to Administration > Issues.
In the sidebar, go to Fields > Custom fields.
Click Add custom field.
In the sidebar of the window that opens, click Advanced.
Select the Checklist Read-Only Proxy field type and click Next.
Enter a name and description for the new Checklist Read-Only Proxy custom field and click Create.
If you are using the Proxy to display Checklist information directly within issues, on the Associate field Checklist Read-Only Proxy to screens page that automatically displays, select the screens on which the new Checklist Read-Only Proxy custom field should appear and click Update.
If you are only using the Proxy to display Checklist information on Agile cards, skip this step.