Support — Rasd
The fastest way is from inside Rasd itself, and you review what you send before it is sent.
The fastest way is from inside Rasd: open Settings → About → "Report a problem". Describe what happened, attach an image if you like and redact anything in it, and review exactly what will be sent before sending. Reports reach a private support repository and are never published. Error messages in Rasd also carry a "Report the problem" link that fills in the tool and error code for you.
Sending a report needs "Local only" turned off in Privacy. If you prefer to keep it on, copy the report as text from the same dialog and send it through the contact page on this site or by email to isultanby@gmail.com.
To delete a report you sent, send a new report saying "delete report #number".