For different software you can find here illustrated guides:
- How to request and pick up certificates
These guides describe how to generate a cryptographic key pair and to request the public key to be certified, and how to combine everything into a digital ID after receiving the certificate.
- How to import and use digital IDs
These guides describe how to import a digital ID into email programs and other software and how to use it.
These guides describe special situations: Creating keys with OpenSSL, Updating an existing digital ID with a new certificate etc.