I know Chordious 1.0 isn’t the most intuitive program to use, but it really is pretty powerful for making custom chord diagrams. Now, if you’ve poked around a bit, read the written Chordious tutorial, and are still confused (or even still on the fence for giving Chordious a try), I’ve gone ahead and made a video tutorial and uploaded it to YouTube:
It’s a little, long, but that’s only because there’s so much to say! Seriously, my first video was over an hour long. Also, probably best to view it in HD and fullscreen, so you can see the text.