You need to make sure that the input to that agile board (can be a filter or project or multiple projects) contains that epic.
So, check what is the input to your board, if it is just a project, then move your epic to that project and it will start appearing on the agile board.
If its a filter, then modify the jql filter so that it includes the epic you just created.
To elaborate on Rahul's answer, cos it took me a while to understand the implications:
project = project-name AND assignee in (user1, user2, etc) ORDER BY Rank ASC
project = project-name AND (assignee in (user1, user2, etc) or type=epic) ORDER BY Rank ASC
...It's true that there are projects in Jira; but they are merely a way to cut off issues, to tell them apart from other sections of work and to apply rules that are specific to that team (the schemes)....
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