I wrote a wikiHow article on how to use these. Please feel free to read and critique. (If you are so inclined you can edit it yourself too.) Also thanks to Melissa for making an awesome video that I embedded in the article. :)
How to Use an Instead Softcup
Also I'm trying to come up with all the reasons that a cup could leak and put them in the tips of my article about using reusable menstrual cups:
Troubleshooting for Leaks
Can anyone think of any more reasons?
P.S. I made a lil instead icon: