Open 2 tabs/ internet windows.
In the first one, open your DIS Profile - click on User CP along the top of the page, and then on Edit SIgnature
In the second window go to tickerfactory.com or click on one of the tickers below.
Chose Vacation & Travel - as you will see there are lots of things you can count down!
Chose your base line design, then the marker that moves, and finally enter your date. It will then give you a bunch of codes. Use the 1st box (HTML) select it all (Ctrl + A), copy (Ctrl + C), go to your DIS signature, and paste (Ctrl + V) the code into your signature.
Hope this helps!
Bex