Resolved After Checkout Page

Hello,

I got a problem with my after checkout page.

I bought something to test if my checkout works and after that I came to this page. (attachment)

I want to customize this text, but I don't know how. In some tutorials they say that you have to create an article with your text and than paste the article ID to your payment method under "article id for thank you message".

But the problem is that my plugin PAYPAL PLUS don't got the option. There is no box for the article id. (attachment 2 & 3)

Does anybody know a solution for my issue?

Thank you in advance.