CLI-only features
As you can see in the Feature / Platform Matrix, the entry level models have a number of features that are only available using the CLI, rather than appearing in the GUI.
You can open the CLI console so that it automatically opens to the object you wish to configure. For example, to edit a firewall policy, right-click on the policy in the policy list (Policy & Objects > IPv4 Policy) and select Edit in CLI. The CLI console will appear, with the commands to access this part of the configuration added automatically.
Once you have access to the CLI, you can enter instructions for specific tasks that can be found throughout the FortiOS Handbook. Options are also available at the top of the CLI Console to Clear console, Download, and Copy to clipboard.
Refer to the CLI Reference for a list of the available commands.