How do I make my photostream private on Flickr?

Related questions

1. Is Flickr free for commercial use?
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3. Is Flickr safe?
4. Is Flickr copyright free?
5. Can I delete photos after uploading to Flickr?
6. Does Flickr exist?
7. Is Flickr still alive?
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Tags

1. #private
2. #stream
3. #organizer
4. #everything
5. #already
6. #first
7. #thumb
8. #follow
9. #click
10. #default
11. #select
12. #permissions
13. #bottom