How to unlock Epic name field

[Elena Sholk]

http://prntscr.com/n6c377

[Yogesh Mude]

HI @Elena Sholk 

Don't do it...as due to some reason Application has been locked by default and if you change it then may be the core functionality will not work as expected.

Still if you want you can do it, please have a look at the below article.

https://confluence.atlassian.com/jirakb/how-to-unlock-a-locked-jira-software-field-779158866.html?_ga=2.221121624.1122258548.1554096634-1229953293.1554096634

[Nic Brough -Adaptavist-]

The screenshot is of Jira Cloud, where you don't have the access to be able to unlock anything.  Not a bad thing - means you can't break it (the lock is there for a good reason)

[Frederik De Roover]

You can't unlock this, because this is a Jira managed field and can't be modified.

Locked > This custom field is managed by JIRA Software and cannot be modified.