Hello Mariangela,
Welcome to Atlassian community!
Epic link is the relation between a standard issue (Story, bugs, tasks) to an Epic issue. That been said, Epics can be linked to other issues and not to boards.
To add an Epic link between an Epic and an Issue, navigate to your issue > Click to edit the field Epic Link and add the Epic you want.
If you want to only display Epics in your Kanban board, you must:
1 - Make sure your board filter is returning the Epics you want (Board Settings > General)
2 - Confirm that the Epic Statuses are mapped to your board columns (Board settings > Columns)
3 - Check if your swimlanes are configured to display it (Board settings > Swimlanes).
Once you have these three settings properly configured, the Epics should be appearing in your backlog and board views.
For more information about Epics, you can check the documentation below:
Working with Epics
Let me know if this information helps.
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