Sharon, I love the fact that this:
looks so much like this:
Ann, if you can figure out how to transfer photos from your camera to your computer, here's how to upload those photo files from your computer into a message on Eratosphere.
In Eratosphere, when you use the usual "Reply" (or "New Post") option--the following doesn't work in "Quick Reply" mode--you should see two rows of doohickeys and thingamabobs and bells and whistles above the message window, like stops on an organ.
In the top row of doohickeys and thingamabobs and bells and whistles, click on the icon of a paperclip. This conjures up the "Manage Attachments" menu.
Under "Upload File from Your Computer", select "Choose File", and you should see a menu of the contents of your computer. Navigate to wherever you've stored your pictures, "Select" the one you want, and voilą.
If the photo is too large, you may need to swear at it for a while until you can figure out how to save it in a smaller format, and upload that version instead. I find the epithet "A thousand curses!" to be very helpful.