You can change a self-signed certificate or domain key name, but you cannot modify any other part of a certificate. To change another part of a certificate, you must create a new certificate.
See Adding a self-signed certificate.
See Adding a domain key.
You cannot change the name of a Certificate Authority-signed certificate.
To change a self-signed certificate name
Check the box beside the certificate that you want to modify.
On the Edit Certificate page, type the new name of the certificate in the Certificate name field.
To change a domain key name