is tihs site scam or i did something wrong ... ?

[Yawoor]

hello.
today i received voucher for 4$.
so i entered this site and http://www.mouse-sensitivity.com/forum/store/redeem/ paste code.
now i can see that "You have $4.00 credit."
how can i use this 4$ to get 1 month subscription here ?
cause i dont see any other options than CHOOSE PAYPAL and if i pick it up, you will take from my account each month 1.99$, which i DONT WANT TO!
 
if buying subscription is not available with my 4$ debit, please refund this money.

[DPI Wizard]

Go all the way to the check out, and select "I have a coupon to use", then use the voucher code there. Tell me if you are having problems, and I will help you