It's a bit difficult to see from the picture, but it looks like you are buying SimPoints from the website?
If that is a mistake and you do not want to buy any SimPoints, you can close the web page and your account will not be affected.
However, if you DO intend to buy SimPoints, I think you're at the page where you need to put in your payment details. You will need to choose how you are going to pay for them (have a look at your debit card/credit card and find the option that matches) and put your details in while following the instructions on screen.
Just so you are aware, SimPoints do cost REAL money. They're a type of online currency on thesims3.com that you use to buy things from their online store. So don't put in any of your details if you did not mean to spend real money!
