You need help of a friend at a computer to log this cache. Go to the posted coordinates. Put yourself somewhere the webcam see you. The best place is at the corner of the terrace, on the same spot I stood. If You want to show your name, take your nickname with You ( at least A3 is needed with very bold characters ). Phone your friend. He will find the webcam here.
Refresh this page in order to get the new image, with yourself visible on it. Right-click on the image and save it. Make sure you upload the image together with your log.
Hereby You can see me phoning to Lady Datts so she could save the picture. In the background You can see my Caching name on single A4 sheets, one character per sheet.