Support.
Most problems are one of four things. If yours is not, tell us from the app.
Report a problem or an idea
In the app, open General, then Help and feedback. Copy diagnostics puts a plain report on your clipboard, and Send feedback opens a new issue with the questions and the report filled in. You read it before you submit it. You can also open an issue yourself on GitHub.
Common fixes
macOS says it cannot verify Rimline
Rimline is not notarized yet. Close the warning, then System Settings, Privacy & Security, Open Anyway. The download page shows the steps.
Nothing happens when I slide an edge
Check that Accessibility is granted in System Settings, Privacy & Security. In General, the Accessibility tile says whether it is. If Rimline is paused, or auto-paused because a game is in front, the menu bar icon is dimmed. Test and tune on the Trackpad tab shows what the trackpad reports.
The menu bar icon is missing
A crowded menu bar, or a menu bar manager, can push a new icon out of sight. Rimline always opens from its Dock icon, and General shows Icon hidden with a Bring it back button.
A gesture fires by accident
Raise the guard time under Protection in General, turn on Require Fn or Option, or turn Rimline off in the app where it happens. Test and tune lets you resize the corners and the strips.
Contact
Use the issue tracker so that fixes are visible to everyone. A direct email address will be listed here when the paid version opens.