If you want the paypal button than do the following:
When you make a new article, or edit an existing article, you see a button below MODULE.
Stand with your cursor in the place in article where you want the paypal button and click the MODULE button and choose the module PAYPAL BUTTON and the code will automatically be placed in the article.
Clear?
So if you opened this article you could see the code, you can also paste this code in an article. So "loadmoduleid 131" without the " but WITH opening and closing brackets { }