1. Open *sidebar (included below for your convenience) and click on Edit.
2. Include one or more cards you want in the sidebar and click Save. They'll look much better if you include them in open or closed view, by adding |open or |closed after the card name.
   

*sidebar

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You can also type text directly into the *sidebar card, but it will show up outside of any card, directly on the page background.

To have things in the sidebar that are only visible to some users:

1. Create a role and assign each of those users to it.
2. Create a card and set its permissions so only users assigned to that role can see it.
3. Put the private content in the card you just created.
4. Include the card in *sidebar.