If the photo is in your e-mail, first save the file to your computer, save it somewhere easy to access like the Desktop or your My Documents folder. If the file in Outlook Express E-mail, click the paper clip in the upper right corner, and click save attachments. If the photo is in web mail like Gmail, Right click on the photo, as shown in this photo and click save picture as.
Next, Start a new message on this site, or reply to a message in progress, you will see a paper clip on the top of your message window, as is highlighted in yellow below, click that.
A new window will open, Click the browse button, as is highlighted in yellow in this photo:
Now locate the file on your computer, (wherever you saved it, Desktop, My Documents, etc.) and click OPEN.
You will be brought back to the upload window once you have clicked OPEN, now click UPLOAD. It will show you once the file is uploaded. Once the upload is done, close the upload window, and you will again see the compose message screen again where you were typing.
Now click the arrow next to the paper clip, and click once on the name of the photo you wish to insert. Example:
Once you click the name of the photo as described above, a new line of text will appear in your message, this means your photo is attached and ready to send to the group. The photo will show up where ever you have the line of text placed, example:
Now you may type whatever else you like, and submit your message as normal.
Hope this is helpful.