Editing a key
Steps
- 
                From the section DKIM Signing Keys, click the name of a key.
                The Edit Signing Key page displays. The current private key displays in the text field.
- 
                Generate a new key; click the button Generate Key.
                A new key is generated and displays in the text field. The only option for key length is 1024 bits. See this Knowledge Base article to increase key length to 2048.
- 
                Click OK. 
                The key is saved and displays in the section DKIM Signing Keys.