The quickest route is inside the app: Settings → Support → Send Feedback. It comes to us with your app version, iOS version, and watch pairing state already attached, so there's nothing to look up — and it works offline, so you can write it on the water and it'll send itself when you're back in range.
You can also email us at support@sailtactician.com. If you do, please include your Apple Watch model, iOS version, and a quick description of what's happening.
We read every message.