To edit one field within a module (speaker, people, session, sponsor, or exhibitor) for multiple records, consider editing in bulk.
Navigate to your module and select all of the people/sessions/groups that you would like to make an edit for.
Click the button "Edit" at the top of your page and select the field you wish to edit within the dropdown menu.
Once complete, click the orange "Update" button at the bottom of the pop-up window.
NOTE: Tags can not be bulk-edited to add new tags to existing ones. When you bulk edit a tag, the existing tag(s) will be removed from a session.