How do I change the value in the Observable which is in the service using only the method through the method getUserInfo()?

```js
@Injectable()
export class UserInfoService {

    public User: UserInfo = {
        firstName: "O",
        lastName: "K",
        email: "ol@op.com",
        country: "uk",
        avatarUrl: null,
        receiveNotifications: true
    }
    private Obser: Observable<UserInfo> = new Observable(observer => {
        observer.next(this.User);

    });
    getUserInfo(): Observable<UserInfo> {
        return this.Obser;
    }
}

```

use service :

```js
openDialog() {
    let subscription = this.UserService.getUserInfo().subscribe(data =>( data=this.data));
    //What should I write here to change the value inside the observable? Please write if it is not difficult
}

```