I am trying to change which credit card is used for payments.
I started to follow this guide: https://support.atlassian.com/subscriptions-and-billing/docs/manage-payment-methods/#Add-a-credit-card
To add a credit card:
1. Go to admin.atlassian.com/billing. Select your billing account if you have more than one.
2. From the left menu, select Payment method
3. Select Add payment details
4. Add your credit card information and select Confirm.
But I am not seeing any left menu as instructed in step 2 above 
I am the "Org admin" in my organisation so I think I should be able to see it.
Any help is much appreciated.