You can display SSL tabs under Manage > Topology: Appliances. Select the name of the appliance you want to edit to expand the page and display the Appliance tabs, and then select the Appliance Pages tab to display the Appliance Configuration Pages list.

Under Appliance Configuration Pages, click SSL to display the Editing Appliance Configuration: <hostname>, SSL page. To display certificates PEM, replace certificates, or generate CSR, select the Appliance Pages tab to expand the page and display configuration setting.