first make your graph with all the points and then once you've done that and you have your graph... double click on one of the scale values on either the x or y axis, look for the 'scale' tab and check the box 'logarithmic scale'....hope it helps
The above is incorrect. There is no option for log scale on the x axis. The data will have to be provided in in logarithmic scale for the x axis to depict it as such.