In order to update any of your contact information, you must login to your Anima account. In your Dashboard, you will see a series of tabs on the left hand side of your screen. Click on "User settings".
Then, click on "Your preferences," where you can scroll down to the bottom of the page, and enter your new phone number in "Update your phone number". Make sure to click on "Save Changes" at the bottom of the page to ensure your new phone number is saved to your account.