In the charts you will have two axes, the x and the y. The y is the vertical one with the y legend appearing on the left side of the chart. The x is the horizontal access and the legend for this appears on the bottom of the chart. Looking at the doc you sent I'm not sure how exactly you would like to chart this info. Would you like the dates to be charted vertically with the users charted along the x?
Also, if your data is coming from your db then you cannot create the recordset for this first. The data selection occurs from within the wizard, in here you specify the table that has the data and the columns to use for the x and y. The data should probably be ordered by the date. Have you setup a chart like this? If so what is the result you are getting with it? Please post back with this and any other info so that we can help you get this worked out.