When you are in your photostream . . .
I think you have to go to 'You' top-left next to the Flickr logo and choose 'Organize'.
You then drag the set into 'Batch Organize' and you can change the settings of the whole set in one go.
Thats my guess, anyway.

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My Wanted List Most Wanted - Bear Model Sofubi
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I love mankind, it's people I can't stand - Charles M. Schulz
blingaling wrote:
I'm still in the "everything is shiny and I want it all" phase