Simply click

( you can complete the subject but NOT delete it  !)

(if it doesn't work :
with IE : just right click on the link , copy the shortcut, and paste it with CTRL+V in the address bar then press Enter

else ( if not IE)  just right click on the link, copy e-mail address, then paste it in the address field of your mail editor
and always enter 'Tabdemo :' as the subject )