Easy! ;) Just access your StubHub account with the current email address and existing password. Go to Profile > Account info tab, click on Edit account info and make the required changes. At latest, tap on Save. 

You can also do it from the Settings section... On the Contact tab, click the pencil symbol beside your primary contact info, make the required changes, and save. 

You will then need to sign in with the new email address and existing password.

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