You can
configure a client certificate to use the S/MIME signature
feature.
Access
Web Config and select the Network
Security tab.
Under S/MIME, select Client
Certificate. You see a window like this:
Select one of the following
options:
CA-signed Certificate: Select
Import if you have obtained a
CA-signed certificate. Choose the file to import and click
OK.
Self-signed Certificate: Select
Update if you have not obtained a CA
(Certificate Authority)-signed certificate and want the product to
generate a self-signed certificate.