When you connect your Smarter Coffee to your router it holds onto those details and cannot be setup with a new router until those details have been cleared.
To clear those details what you need to do is reset the products wifi.
To reset the WIFI simply press and hold the beans button (bottom left), you will see factory reset appear on the screen and a countdown of 3 seconds, keep holding until the countdown finishes, the screen will now reload, once it has reloaded, unplug it for at least 20 seconds.
Now the Smarter Coffees WIFI has been reset and you can redo the setup.
The connection light will still flash green but as long as it has been reset, as above, it is ready to connect again!