[updated 4/16/20]*
For anyone who wants to embed a graphic (such as a chromatogram) in a post, here's the procedure.

1. Convert your chromatogram to an image.

2. Resize it so that it's not too large (I would suggest no more than about 400 x 400 pixels) and save it in one of the following three formats: .jpg, .gif, or .png

3. Upload the image to a web server or hosting site which is accessible via the internet. There are lots of free image hosting services kicking around. I have been using tinypic.com for years, but they have shut down. One that I have just tried (see the pic below) is:
https://imgbb.com/

4. Type the URL into your message, highlight it, and click on the "Img" button. (If you use ImgBB you can simply copy the "IMG" from there after you have uploaded the image).

5. When you preview your message, the result should look like this pic of my dog, Socks:
Image

Note: Chromatography Forum has no connection or relationship with ImgBB; I just happened to stumble on their site, it seems to work, and doesn't seem to be too irritating with ads.

And now, back to our regular programming.