Just log in to your account and then click the "Edit" button.

A menu will be displayed with the options to edit your podcast, go to the "Author details" section:

Here you can edit the name, public email, and Copyright of your podcast. 

Important: The email shown here is not the email associated with your RSS.com account. It is the email that will be used by the platforms to validate your podcast through the author's email. If you want to change the email associated with your RSS.com account, we suggest you consult our article: How to change my email address?