First it is necessary to make the faience paste and the steatite molds. Then the paste is formed into a rectangle and impressed on both sides by the molds. Finally the molded tablets must be dried slowly with air flowing on all sides to allow efflorescence of the glazing flux that is mixed with the faience paste.
See also Reconstruction of Faience Tablet Manufacturing or see more images in Harappa 2000- 2001 slideshow.