Entering Data on the TI-83/84

bulletPress LIST
bulletEnter the values you want in L1 by typing the number and then pressing ENTER.  The cursor will move down the column when you press enter. 
bulletNotice the cell location is listed at the bottom of the screen and the value inserted in that cell.
bulletTo move to the next list use the right cursor arrow. 
bulletYou are now ready to move to setting up a scatterplot.