Hey Jonnymon,
For future reference here is how I connect via serial on the PC using PuTTY - I don’t believe that you can make a serial connection on Cyberduck.
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edit I assumed that you were on a PC but rereading your posts, you may be on a Mac - sorry for the noise if that is the case
When you connect Norns via the USB mini power cable to the PC, you can go into your Device Manager window (windows key + type device manager) and under the Ports (COM & LPT) twirl-down and see the Serial Port number that Norns is located on ( mine is on COM17 but you may have a different port number). Norns will not be named but will show up as a USP Serial Port (COM number).

Once you know the port number, open a new PuTTY session, set the connection type to Serial and change the Serial line to the COM number from the device manager (My Speed is set at 9600 - not sure if this value can change but seems to work great as is).

Once you open the Serial connection, you will see a terminal window that is blank - hit Tab a few times (3 in my case) until you are greeted with a prompt for the norns login: we Passwork:sleep
this should have you connected to norns via Serial.
simply follow the directions that are provided at the top of the thread and you should be all set. Hope this helps - I was a bit lost trying to connect on my first few attempts.