From here:
Can I bias my Fender Blues Deluxe/Deville?
The Blues Deluxe/Deville were made prior to the Hot Rod Deluxe/Deville. They were discontinued in 1996 after the release of the Hot Rods. To answer the original question: Sorry, you can not. These amps do not have an adjustable bias control, they have a fixed resistor that sets the bias range. You'd need to have a tech install a bias pot, and use a bias probe like a Weber Bias Rite or Bias King.
