Add or remove a certificate
For more information, see Certificates.
Add a certificate
Go to Configuration > Settings.
Go to the Certificates tab.
Click Add.
Enter a Certificate Name, select a File Name to upload (must be in
.pfxor.p12format), and optionally provide a Password if the certificate is encrypted.
Click Add.
The certificate is uploaded and appears in the Certificates pane.

Go to Configuration > Settings.
Go to the Certificates tab.
Click
Remove Certificate for the relevant certificate.
Click Yes.