Click Plans under the Billing on your left navigation bar. Click "Edit Plan"
2. Enter the new number of seats you want to downgrade or upgrade to. ( Example. If you have 5 seats and want to add one seat, select 6. Similarly, If you have 6 seats and want to downgrade to 5 seats, select 5 seats.)
3. Verify the amount and click the ‘I Agree” button. If you are adding or deleting seats before your subscription renewal date, your charges will be prorated and the charge description will show how much you will be charged.
Note: You can also change the credit cards from the same screen if required.