index.js

class Profiles extends Component {
  // ... THE REST OF CLASS CODE 
}

// #1. make const named mapStateToProps to mapping our state, to object called profiles
// the state is called profilesReducer because we got it from the profile reducers that we made earlier
const mapStateToProps = (state)=>({
  profiles: state.profilesReducer
})

// #2. connecting redux with Component, we use "connect" from "react-redux" library to do this, don't confuse with the syntax
export default connect(mapStateToProps)(Profiles)