When you first connect to the interface, simply click on Upload, as shown in the following screenshot. You will be redirected to the principal interface where you need to fill in the media details, as in the following screenshot.
The title of the post: This will appear beside the thumbnail.
The author's name: This will have implications related to user's rights.
An email address.
A description: To let your readers know what is it all about. Keep in mind that it will also be used when you share the post, so it's better to write explicitly.
Optionally, you can also do the following:
Pick up some categories to define your upload group membership
Add or use an existing tag for textual researches
Just pick the video from this location; in this case, this is a YouTube video, but it can come from your local PC, NAS, or even the BeagleBone Black itself through its USB access.