AT&T MERLIN LEGEND Installation & Maintenance Manual page 223

Installation
8. Label the button assignment card.
a. Pull the tab at the top of the plastic cover toward you.
b. Type or write the button assignments on the card.
c. Replace the card and the plastic cover. Be sure the
textured side of the cover is facing you.
9. Adjust the contrast on the telephone's display.
MLX-20L. Slide the lever on the top of the telephone.
MLX-10D and MLX-28D. Follow the directions in the user's
guide for the appropriate MLX telephone.
Telephones and Consoles 3-115