First you will need to create your Custom field.
Go to "Issues" under your JIRA Administration menu and go to "Custom Fields" under "Fields". You can then click on "Add Custom Field" and configure it as you would like.
After than you will need to add it to the Screen Scheme that Epic use for you project. If you need to find this you can go to your project setting and see what Scheme is currently assigned to Epics. If you have additional Issue Types attached to the same scheme I would suggest creating a new scheme otherwise your field will show up on all of the Issue Types. You can then go to your custom field, go to screens and make sure the correct screens are selected.
Info on Configuring fields: https://confluence.atlassian.com/jira064/configuring-fields-and-screens-720412098.html
Info on configuring screens: https://confluence.atlassian.com/adminjiraserver071/defining-a-screen-802592587.html
Hope this helps,
You can add custom fields on any issueType in JIRA. But you need to follow the correct process. Please see step by step guide here
Make sure you have JIRA admin rights on cloud.
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