@StevenRas, pbe, pete340
I just released version 1.1.0 which should fix this bug, with a whole bunch of others. You can upgrade running the Upgrade Package command from the command palette.
With the new version, the SVN buffer should be syntax highlighted and it should now be possible to toggle files and folders with space/y/n like the instructions say.
To actually commit, as the instructions say, just save the buffer (ctrl/cmd+s).