I'm waiting on my cactus buds and will have some blooms to post in a couple of days. I'm showing a Penstemon superbus that bloomed for first time this spring.
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Admittedly, it wasn't easy figuring out how to post pictures. I gleaned information from link at bottom of message. Maybe someone can volunteer more updated instructions than those in forum help.

Basically, upload digital images from camera to computer. Upload pictures from your computer to Photobucket (or some other photo storage site on the web). Copy your photo's HTML code from the web site and paste it in your message on separate line(s) from your text.

Good luck.

Here is a link that might be useful: Help