Tutorial: Mass Change a Field
1.
2.Select the field you want to modify from the drop-down list
3.Type in the text you want to apply to everyone in the displayed group OR choose from the drop-down list of all the text already in that field.
4.TntMPD will confirm that you want to make this change, since you cannot Undo the change. (TntMPD does do an auto-backup before performing this action. If necessary, you can restore a prior backup.)
Read More > Backups

Remember: This action replaces all existing text, if any, for all members of the Current Group.