How to make Jira ticket description field ready only apart from Reporter ?

Nitish Menon

I have a requirement to restrict the assignee or other members from the team to restrict editing Description from editing once assigned. 
Only Reporter should have permission to edit it anytime in future. 

I am new to Jira. Pls. guide me with screenshots if possible or steps. 

Joe Pitt

JIRA doesn't have field level restrictions out of the box. You may be able to do it with a scripting plugin, but I see you're on the Free version so I don't know if you can install plugins. I don't use scripting so I can't help you there.