If you already have your SSL Certificate and just need to install it, see
SSL Certificate Installation | F5 FirePass.
How to generate a CSR in F5 FirePass SSL VPN Appliance
Fill out the Certificate Request Form
A simple form will display. Enter your company's legal name and address information. The common name (domain name) entered should be the fully qualified domain name that will be used to access the F5 Firepass Device. For example: vpn.your_domain.com
Download the Certificate Request
When you download the CSR, you will receive a .zip file that contains both the CSR and the private key. Save the private key in a secure location. You will need this private key later to install your certificate.
After you receive your SSL Certificate from DigiCert, you can install it.