In the section SSL Certificates included in LSLB is the action Upload Certificate. This leads to a form to upload a certificate to the load balancer. Select a local file and click Upload, it will show in the certificate list.
First, select the secure certificate file in PEM format to upload to the load balancer from your local computer and then press the Upload button. After that process, you’ll have available the new certificate in the certificate list and ready to be used for any LSLB farm.
Check out the PEM SSL certificate generation if you have any doubt in regards to the certificate format required.
Next step, see the certificate info.