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Hi Marek!
You can set a password before publishing/sending a collection in the collection status box on the right.
Once the collection is sent, you can’t make any changes*. This is intentional. (You can always re-open the collection, make edits, eg. set a password, and then send it again.)
*There is a way however: Clicking on “Quick Edit”, when hovering over a collection on the collection overview screen, you can set a password, even if the collection status is “sent”.
I hope this is helpful.
Cheers
Florian