Instrumental motivation involves learning in order to achieve some other goals. So if you learn English because you will get a better job if you speak that language, then your motivation is instrumental.
We say that someone is ‘integratively motivated’ if they are learning the foreign language through a desire to learn more about a culture, its language and people—to ‘integrate’more within the target-language society. They learn the foreign language for love of the target country and its culture. This is integrative motivation.