If you mean taking a chart in Excel and posting it here, the easiest way I can think of is to take a screenshot (by hitting the Print Screen button - it should be next to F12) when the entire chart is visible on your monitor. Then, paste the screenshot into a program like Paint and crop out everything except for the chart (the easiest way to do this is to copy the chart and paste it into a new picture). Finally, save the picture and upload it to a place like
ImageShack, and then post it here.