Once you have a firewall, you will need to create your own Outbound NAT rules.

1) Open the firewall you created under Edge Gateways

 2) In order the get internet access, you will need to create an outbound NAT rule for the internal network you created. Select NAT on the left and then "New".

 

3) Create a rule like the one below and request an external IP from Public 2 for the external IP. The IP addresses externally are charged. You will need to input the private IP address behind the firewall.