One of the other experts provided me with instructions on how to post a photo...
Thanks Dr. Fiona!
You need to post your files on your question page, so the expert can see them. On your question page, there is a tool bar above the reply box at the bottom of the page. If the tool bar is not showing, click "show tool bar". Once you have the tool bar showing, here are the instructions for posting your files:
For graphics, click the tree icon and then browse to choose a GIF, PNG, or JPG. Upload and then insert it.
For zip files, PDFs, or spreadsheets, you need to use the link tool. Enter text (like "download this") in the reply box and then double-click to highlight it. The link is the tool to the left of the tree. In the upper right corner is a browse dialog box, which you can use to locate your file. Select it and then insert the link. Use the Preview button if you want to test the link and see if it works correctly.
File size is limited to 1 MB.