Hey hun!
To upload a pic, look where you reply, all your icons above you will see a little paper clip. Click that and it will open a new window.
You want the top option, Upload from your computer.....select browse and it will open your pc files, find the photo and click on it.
Then to the far right of where you clicked browse, there is an upload button, click that and wait....when it is done. Once it has uploaded you will see current attachments on the left hand side. Close this wondow.
Then when you get back to this screen, click on the paper clip again and it will appear in text form, just click it and it will attach to the post.
I know it sounds complicated but its simple really xx