different Public IP to every VLAN

        rule 5000 {
            description "SNAT VLAN1"
            outbound-interface eth0
            outside-address {
                address wan.ip.add.r1
            }
            source {
                address [VLAN_1_subnet]
            }
            type source
        }
        rule 5001 {
            outbound-interface eth0
            type masquerade
        }
    }

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Do essentially this for each VLAN and/or public IP address in the assigned IP block.

Do you know how ubinquiti works ?

IT's all GUI.

I need the GUI way!

IT's all GUI.

Wrong. Ubiquiti has GUI *and* CLI. Darrell gave you a correct answer, even if you don't like the fact it's using CLI.

I need the GUI way!

https://help.ubnt.com/hc/en-us/articles/204976494-EdgeRouter-Source-NAT-and-Masquerade
In your case, it sounds like you're interesting in the Masquerading. Follow the web UI directions for that.

I'm not using CLI , im using GUI.

Also I don't have the edge max router I have Ubiquiti Unifi Security Gateway (USG)

this is what I can see (picture)

Darrell Porter ,

How do I get to the CLI command prompt?

you can access the cli command prompt over ssh. as far as i remember, you are required to press a button on the router to allow access.

you may have a look at the "remote access" menu in your screenshot as well.

--

the settings are definitely available in the gui. the proper location would be "NAT" or possibly "masquerade"

they should most likely be directly available under "firewall" may be you need to dive into the "networks" submenu