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Go and click on the profile tab (icon next to log out) > click on the + and add another/new email address first > verify it > go back and click on update and tick the box underneath that says make primary > then you should get the remove option by the old now no longer primary email. You can remove that one or leave it on as you can have up to 8 email addresses on the one paypal account.
Advice is voluntary. Kudos / Solution appreciated.