Click on "Go Advanced" - blue rectangle - to the lower right of the reply box
Then another screen comes up
Scroll down a ways - then a tan bar shows up that says "Additional Options"
Under that is a blue rectangle that says "Manage Attachments" in it
Click on that
Then a pop-up appears in the upper left hand corner
If adding a picture or scan from your computer:
Click on "choose file"
Then select it however you do from your computer
Then the name of the image shows up beside "choose file"
THEN press "Upload"
Then when it's loaded, it shows up in that same drop down box as a "current attachment"
After you are done loading (up to ten) your attachment(s), there is a "close window" button at the bottom - press that and that drop down box disappears
Then the reply page appears - you can edit at this point -
I don't know what happens if one presses "preview"
Press "Submit Reply" - blue box at lower right at the bottom of the page
It is actually fairly easy - once one figures out HOW -