Hey Cassandra, I really appreciate this feedback ... and I agree that this is a challenge that I'm trying to find a good solution for. There is some in-app documentation (click the question mark icon top right, next to the red "Delete data for this board" button) and this will reveal some help, however I'd be keen to improve this. I've discussed this within Atlassian to figure out a better solution for this.
In the meantime I'd suggest that anyone that wants to provide feedback or ask question posts to https://community.atlassian.com/forums/App-Central/gh-p/app-central using the tag "sprint-capacity-analysis-app" which I'll subscribe to: https://community.atlassian.com/forums/tag/sprint-capacity-analsysis-app/tg-p
To reassure you, this is definitely NOT going to become a paid application because it's an Atlassian Labs offering, and as an Atlassian employee I can't charge for this. The background to this is that I've built this application to help teams within Atlassian (including my own) to achieve predictable delivery.
I'm planning to put together more documentation to help people understand how to use the application and will share as soon as I can!
Thanks again for the feedback, the review and your patience!
Kind regards,
Dave