you might also need to remount the root file system as read/writable (it displays that warning when you first log in).
To do this just type (without the quotes)
"mntroot rw"
If you're using yifanlu's usbnet, you need to set the password before you SSH in. This can be done by typing (minus the quotes)
";un password YOUR_PASSWORD_HERE"
in the search bar on the main screen of your kindle. Just be sure to replace YOUR_PASSWORD_HERE with the actual password you want to use. Then use the password you set to log in.
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