1. Go to http://paypal.com (opens in a new window), sign-in, if you don't have an account you can create one. Make sure you add at least one payment method
2. Make sure you account is a business account, if it isn't upgrade to a business account-don't cost nothing. Otherwise you cannot create the Paypal Merchant buy-now/add to cart buttons.
3. Click Merchant Services, on the left side Merchant menu select Website Payments Standard.
4. Select the type of button you need, and build your button and get the code.
6. Once you have the code, you can insert it into Office Live using the Paypal Module which is located under Module in the Page Editor.
Just paste your code in the module and click OK. The Paypal module can be place inline with text, or floated left/right like the rest of the modules.
Hint: If you are selling several items and need to line them up, use a table to line up any text, images, and Paypal buttons.