Your iCodes Username and Subscription ID is located on the 'Home' page of your iCodes login area.
To enable your iCodes feeds to work you will need to know your iCodes Username and Subscription ID, your username is what you chose when you registered for the webservices account, and the Subscription ID is allocated to you once registered.
If you think someone maybe using your details to import your feeds you can easily generate a new subscription id by clicking 'Generate New Subscription ID' once logged it, please note doing this will require you to update the subscription id in all the places you are using it.