Dual WAN dhcp to static. Where does the gateway go?

Hello. 

We have one EL3 on wizard 1.8.5 dual wan with  dhcp. 

We we need to change wan2 (eth1) to static. 

In the GUI it asks for the ip, but no gateway. So it does not work. 

Im asuming I need to add it via cli? 

Still new on the cli. Can someone please share how it should look?

or the process to edit it and hopefully not bring the LAN down. 

thanks.