Need help configuring a Sonic Wall TZ 170 for SSH

I have little to no experience configuring sonic wall firewalls. I have done port forwarding on Linksys and Netgear routers. We have an Ubuntu system in our office that we would like to connect to remotely via SSH (Putty). Internally we can attach to the router via Putty from another workstation. I have already exported configuration file as a backup. I am looking for a ruff outline of steps needed to get SSH to work. Do I need to configure NAT?  Thanks