How to update status of Epic tasks in Jira Cloud

[Jan Mikkelsen]

Hello,

i was looking though google on how to automatically update my Epic tasks in Jira Cloud when all tasks below change status to either in progress or completed.

I was directed to use Update Issue Custom Field via Misc Workflow Extensions  however icant firguer out where to start setting this up.

I have installed the plugin and gone through the documentation, but im at a loss on where to begin. 

Any advice?