To check your statement or account balance online with Washington Mutual Card Services, you will need to visit their official website. Once there, you can look for the login section where you can enter your account credentials. After logging in, you should have access to your account dashboard, where you can easily view your current account balance and recent transactions. If you are a first-time user, it may be necessary to create an online account by following the prompts to register using your account information. Ensure that you have all required details handy, such as your account number and any identification information. If you encounter any difficulties, it is advisable to refer to the website for assistance or further information.