Adjusting the scale that will be used to rate the entries for your awards is done from Event settings > Judges by pressing the (Voting scale) button. There you can choose from a minimum value of 5 (for a voting scale from 1 to 5) to a maximum of 100 (for a voting scale from 1 to 100).
Please note that the Voting scale is locked when there are already entries with a score given to them by a judge. To unlock the scale you need to delete all current votes from Analytics > Individual votes.