If you lost the Application Code that was sent to you when you activated your account, you can get it again. For that, you should:
1 - Via browser, Access the Account Page and login;
2 - In the side menu, go to "Account";
3 - Click on the button "Resend Application Code";
4 - Confirm the operation by entering your PIN Code ;
5 - Access your email account. An email message with the Application Code has been sent to you (this email will be identical to the one sent to you on the day you activated your account).
You can see the whole process in this video: