It's pretty easy. Download the dialer from the relevant link provided in your credentials email and place it in relevant folder. Common paths are provided below:
Win 7 : C:\Users\DELL\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
VISTA : C:\Users\DELL\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
XP : C:\Documents and Settings\Administrator\Start Menu\Programs
"DELL" in above VISTA and 7 paths is assumed default user on our test computer. It would be different on your computer e.g if your computer's default user is JohnDoe, your path will be:
C:\Users\JohnDoe\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup