Remote Forticlient IPsec VPN- Fortinet router is behind NAT'd FW

Trying to configure a Fortinet IPsec VPN between remote clients and a Fortinet 80E in a private network, but the Fortinet 80E is behind a router that NATs the public IP address.  How do I configure the Fortigate (is it NAT-T??) and most importantly how do I configure the Forticlient since the source IP address it asks for will be NAT'd??