To see your remaining bandwidth, login to your account and click the UPGRADE MY PLAN button located in the upper right corner.
This will take you to your purchase page. You are able to purchase more bandwidth or upgrade your plan, but also to see your current bandwidth as well.
This is found under the "BANDWIDTH USED" listing as seen below:
Please note, there is around a two hour delay in reporting of bandwidth consumption. So if you just had a major event about an hour ago and are worried about your remaining bandwidth, please note that it will take a couple hours before it's reflected here.
If your concern is that you don't want to run out bandwidth, be sure to reference our Overage Protection feature.