Oh, now I know what you mean. You don't need to paste that key. You need to save that key somewhere in case you loose your phone to reactivate google authentificator and get the code.
Google authentificator is a security layer so you have extra protection.
So follow this steps.
Download google authentificator on your phone from the app store.
Open the application, click on the plus on the left down side. Scan the barcode or enter that secret key that you wanted to paste there. You will see a timebased code
Enter this code there on the site
Thank you for the help, I really appreciate it. I got it working now.
No problem. Glad you did.