How do I add this script to change an experation date!

Hello,

I have used a script on my web site for some coupons that expire two days after
the date on the person that is viewing them on there computer using the date on
their computer (makes people get a hold of me quicker because the coupon expires
quickly0.

I am kind of new to scripting I have gone into LIveCycle I have Acrobat 8
installed. What I want to do is put this script in place for a date where there
is text. Can anyone help me out with this I'd really appreciate it!! The script
is as follows.