When viewing the results of a Query, the Actions button in the upper right corner can be used to perform bulk edits or updates on all records included in the results.
Click on the button to view a drop-down menu of available choices. These choices will vary, depending on the Query Type. Click to select a specific Action and you'll see a new window, where you may enter or select data, depending on the desired Action. This window will also have a confirmation step; make sure the record count listed is accurate before confirming and clicking save.
When performing bulk edits or updates, it is strongly recommended that you always name and save your query.
Once the bulk action is complete, you will receive and email notification.