Hey good luck Tasha!
To upload a pic from your computer this is how I would do it:
1. Go to "Advanced Reply" (rather than "Quick Reply")
2. Below the big writing box is a section called "Attach Files", click on the "Manage Attachments" button
3. That brings up a new window, click "Browse" to find the file on your computer, wherever you've put it.
4. Click "Upload" button
5. When you're all done, then Submit Reply.
xx