Do I need a Google Account with Gmail in order to update my DoubleClick sign-in information?
No. You can use any email and password combination (with some technical restrictions) you like to be your DoubleClick sign-in. We encourage you to use your work email address (firstname.lastname@example.org). If you don't have a Google Account that uses this address, we recommend you create one. Please avoid using a personal Gmail Account or creating a Gmail Account for business use.
If you use the same computer to sign in to both your business and personal Google Accounts, always make sure that you're signing in with the correct email address for your business Account. Learn why.