Bulk editing privacy settings takes a few quick steps:

1. Select the checkbox of the shortlinks you'd like to mark private and the dropdown will appear.

2. From the dropdown, select "All # of bitmarks" (to bulk edit privacy settings for all of your shortlinks). You can also select a specific number of shortlinks to bulk edit.

3. Click on "public" or "private".

Note: You can also always click on the lock to the left of a shortlink to make an individual shortlink private or public. 

Learn more bulk action tricks here.