It is easy to reply to emails from Opera in Yahoo Mail. The problem: You can select the word Delete so it has a light rectangle around it, but you can't find a way to actually actiivate the delete function. The solution: After you have the light rectangle around the word Delete, hit the button at the left of your N800, the highest one on the face of the N800, surrounded by the four small directional buttons. This presses the key you have selected with the rectangle.