When the  money value of time price  increases by $1,  the demand curve shifts downward by $1.  In other words, people would be willing to buy the same amount of the good if the TOTAL PRICE stays the same -- that is, if the money price falls so that the fall in the money price exactly offsets the rise in the time price.  The quantity demanded is the same if the money price falls by $1, because that exactly offsets the $1 increase in the time price.  This appears in the graph as a downward-shift of the demand curve by $1.
 
      Similarly, when the  money value of time price  falls by $1,  the demand curve shifts upward by $1.  In other words, people would be willing to buy the same amount of the good if the TOTAL PRICE stays the same -- that is, if the money price rises so that the rise in the money price exactly offsets the fall in the time price.  (If the money price does not rise, or rises by less than this, then the people want to buy more of the good.)  The quantity demanded is the same if the money price rises by $1, because that exactly offsets the $1 decrease in the time price.  This appears in a graph as an upward-shift of the demand curve by $1, similar to the shift in Figure 6.5 of the textbook (page 144).