The first step in linking accounts is to visit the multiplayer menu. From there, you will have two choices based on the particular gaming system you are using. If you are playing PlayStation 3, you will choose Play Online. If you are using an Xbox 360, you will need to select the option for Xbox Live. This will take you to a new menu that is designed for the system you are using.
Once you have entered into the new menu region, you will need to select the Barracks option. From here, your next step will be to select the Web Stats option. Once you have done this, you will be presented with an original and unique web stats code. Immediately copy the code and save it because this code will be the key to linking accounts.
Now, go to the games main website at CallofDuty.com and log in. If you do not have an account, you will be required to register. This process is not a long or complicated one and it will only take a few minutes. Upon completion of your registration, you will need to select the My Account function. It is from the My Account section that you will be able to launch the process that will actively and properly link your accounts. The way this is done is by simply selecting the icon that reads appropriately enough Link Account.
As soon as you have finished selecting the Link Account icon, you will need to select a platform. Once the platform has been selected, you will be asked to provide your Gamer ID which is either your Gamertag or your PSN ID. Immediately after doing this, you will be required to enter the web stats code that you had previously acquired. You did remember to keep a log of it as suggested, right? Enter the web stats code in the required box and hit enter. Upon completion of this to will need to go to your profile page and select the function COD WW DOSSIER. This is where you can complete the action of linking your accounts.
Once again, the process is very simple and as long as players follow the recommended steps, they should be able to link accounts with little or no problem.