You can post it on the feedback hub app. Windows insider builds are made in a way that they automatically sent the diagnostic, problem reports and telemetry data to Microsoft, so most of the time you don't have to do anything. just make sure your Internet is connected, PC is turned on and in Settings app => privacy => diagnostics and feedbacks, it is set to full. that's it. you can use Feedback hub app to further report problems and add problem repros.