To upgrade your account click the Account Info link in the blue top area, and then you'll see the screen above. Then click the Upgrade Account button.
You'll then be taken to the Upgrade Account tool. From here you have several options:
- Upgrade the number of emails for just the current billing cycle.
- Upgrade the number of emails for both the current billing cycle and all future billing cycles (a permanent upgrade)
- Upgrade the number of data bytes for just the current billing cycle.
- Upgrade the number of data bytes permanently, for the current and all future billing cycles.