Scattered Charts Plots overlay-unclear explanation

As did other questioners, I want to overlay two scatter plots. I use Numbers '09 on an iMac 10.6.8.
To make a single scatter plot I have to select two columns of my 9 column table and then select the graph icon and select the scatter plot. I make a plot of columns A and I, and another of columns A and J. Jerrold Green said " it's as easy as selecting your second data set and dragging it into the chart."
But I cannot seem to do that. I have the A-I chart and then I select columns A and J, but I cannot manage the dragging. Moving the mouse after making the selection just selects more columns. If I just select column J, then I can drag that to the graph, but that produces a cluster of points all lined up vertically, which is clearly wrong. How do I "select my second data set and drag it?"
Column A is dates, and the other columns are numbers, so I have to use the scatter plot, and I cannot select the three columns to make the plot, that does not work,
Bruce Shore

Bruce,
Make sure that you have selected Share X Values. It's on the Data Range menu in the upper left corner of the highlighted portion of your Table when the Chart is selected. Icon for the menu is a gear.
Jerry

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Scattered Charts Plots overlay-unclear explanation

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