“… When you report a bug, you are doing so because you want the bug fixed. There is no point in swearing at the programmer or being deliberately unhelpful: it may be their fault and your problem, and you might be right to be angry with them, but the bug will get fixed faster if you help them by supplying all the information they need…” Read more… How to Report Bugs Effectively.
You can also provide some references to supplement your report. For instance, you can take screenshots using a tool like Gadwin Printscreen. You can also capture the bugs together with the steps to replicate them on video through a tool like CamStudio.
Acknowledgements: Thanks to Roy for sharing the file.