When in the game, enter any PES online mode (a ranked match, Master League Online, etc.) and you will be asked to enter some information. You will need to enter:
* Your KONAMI ID. If you haven't got one yet, you can create one for free here: https://id.konami.net/login.do
* Your KONAMI ID password. This is the password that you created along with your KONAMI ID. If you have forgotten this, you can retrieve it using the above link.
* Your PES 2013 registration code. You can find this on the back of your PES 2013 game manual. If you have a digital download version of the game, you should have been sent a registration code along with your download.
Once you have provided this information, your KONAMI ID will become linked to your game registration code and you'll be able to get started online!