Hi Amelia,
Can you describe in more detail what you are trying to do?
VidGrid is a video streaming service, so you wouldn't normally go into it to "send a message".
We have it integrated with Canvas at our school, and instructors and students can follow the VidGrid link (or whatever your school calls their VidGrid service--we call it "Academic Video") from the Canvas course menu to connect to our school's VidGrid server and record videos.
Your school may also have VidGrid linked from the Rich Content Editor, so VidGrid would appear under the "External Tools" icon in the RCE toolbar. This allows users to embed a VidGrid video in whatever they are writing in the RCE.
Mike
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