I tried that tutorial yesterday, and then again just now, and after inputting the username I get an error that says "server refused our key". I am at a loss.
Sorry Zander, possibly we are missing something here, maybe it is due to a configuration made during the droplet configuration on Forge, may you want to contact the DigitalOcean support or forge (if they have).
Assuming you have an SSH key pair, you need to assign your public key to your droplet from within Forge.
After that, you should be able to connect via ssh using your private key.
I keep getting "Disconnected: No supported authentication methods available (server sent: publickey)" whether I put in my droplet IP or forge@IP. What am I missing?