Follow the steps below to Delete an Epic
Go to Kanban Board > Go to an Epic > Click on three dots (at top-right corner) > Click on “Delete“
If you do not see the Delete button, go to “Project Settings” > Click on “People” > Click on “Add People” > Add yourself.

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What if you do not see the Epics in the Kanban Board?
Go to a Story > Click on “Show 6 more fields” (at right side of the pop-up) > Go to Epic Link and click on the Empty field > Select an Epic from the List
If you want to see all the Epics, Go to “Search Bar” (at the top-right side) > Select “Advance Issue Search” > Click on “Switch to Basic” > Click on Type filter and select Epic from the dropdown list