Depending on your plan, you can select Member ID Card under Account in the main menu after you log in. If it's available, you can print your member ID card from there. Just click on the Download Card button to download and/or print your member ID Card.
On the Express Scripts Mobile App
Tap the menu icon on the top-left corner of your screen. Go to My Account and choose Prescription ID Card. You can use the mobile app to show your member ID number at your pharmacy or doctor's office.