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Channels can be managed by one or more people who have owner permission for the channel. If after a channel was created you decide to edit the channel's metadata (for example, name, description, owner permissions), follow the steps described in this article.
Before continuing with this tutorial, you must be signed in to Microsoft Stream. For information on how to sign up, see this article.
You could restrict who else could contribute to your channel.
Only those people you add as contributors are allowed to add videos into your channel. You can only add people who have already signed up for Microsoft Stream, if you don't restrict channel contributor, by default, everyone could add videos into your channel.
In the Microsoft Stream portal, find a channel that you want to edit.
You can either select My content > My channels and search for your channel by name.
Or, go to Browse and search for your channel.
Once you find your channel, click on it and press edit. In this dialog you can edit name, description, and who else can contribute to the channel. Channel's name is limited to 30 characters. Channel's description is limited to 4000 characters.
When you are done editing, press Apply changes or Discard and go back.
To set a poster image for your channel, click edit on the channel you own. The ellipsis (...) icon will be displayed next to each video in the channel. Click on the icon of the video that you want to use and select "Use thumbnail for channel cover page".