Why can't I change the second email for my form to be sent to?

I would like to change one of the two emails that my form submissions get sent to. I don't want to add another one I just want to change the one but it keeps telling me I need to upgrade to do this but I am confused because it already let's me have two emails so this should still allow me to have two. Please help me.

We grandfathered old form settings which means multiple recipients are kept, but you cannot add another or change settings until the account is upgraded. You can delete the current email template, but doing so won't allow you to add two or more recipients on the new template that you are going to create.