The wizard should be going
"You have configured a PPP dialup connection. I see you have an ethernet,
do you wish to configure this machine as a gateway for them"
"You are using a dynamic IP address, I will enable masquerading blah blah"
"You have a static IP address. Do you have a range of addresses allocated
by your ISP for the other machines"
and setting up the routes/masq rules
You currently have low security selected. If you are connecting to the
public internet you may want to change this. Do you wish to update your
security settings ?
and the relevant bits should be in the config tool.
Closing since we don't ship rp3 anymore.