how to change cover/edition

[David]

I have designed a new cover for a book, created a new edition but I can't find how to make it replace the old cover on my dashboard and elsewhere. I cannot find a link that says 'make this the main edition' or words to that effect. Can you help?

[Philip]

You cannot change your Dashboard, but you can change what people see when looking at your Author page.

Here is how to set your Default Edition.
Set Default Edition