Here is how I do it:
1. Once you made the graph in whatever program or online server, hopefully it allows you to save the graph as picture file. JPG and PNG formats are probably most useful for this purpose, with PNG giving much better quality for simple graphs. If you cannot save directly, use screen capture (an option available in many graphics programs used for pictures, photos, etc).
2. Once you have the file saved, upload it to ImageShack at
http://imageshack.us/. Mostly self-explanatory there. Chose "resize" to 800x600 (a little too small) or 1024x768 (a little too big). It will prompt you to register but you don't need to do it. In a left upper corner below message "Upload Successful", click on the image thumbnail. It will take you to the page with full sized image. To the right of it, click on "Embed this image" and copy "Forum" entry.
Then paste it here. Delete everything except the URL and bracketed "IMG","/IMG" statements. E.g. keep this: [img]image_URL[/img]
That's it. The image in the URL will be shown in your message.
(Alternatively, in Firefox you can right click on the ImageShack page with your image, select "Copy image location", paste the URL here, highlight it and select Img in the formatting options above. This will simply enclose your URL in the [img],[/img] statement, which is understood by the bulletin board's software).
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