Populate the field for limit to 250 and hit apply and make sure Total Traffic is selected.  You can also set the alert for any percentage of usage you like.  Mine is set tot he default 90%.

You can gain a visual inspection of your bandwidth usage in a couple of really nice ways, but the way that is preferred will be described further down.  After all, are you going to remote desktop into your Home Server every time you want to monitor your bandwidth usage?

• You can view your bandwidth consumption in a graph displaying usage in 3 forms: Last few hours, Last Few Days, and Last Few Months: Right click on the tray icon and select Statistics

• You can view your stats in a far more detailed display. Right click on the tray icon and select Statistics Grid. The Statistics Grid has 4 tabs to display Bandwidth Summary, Hours, Days, and Months.  The breakdown will show you individual selections under each tab.

The next step, which I love, is configuring BitMeter II to display your bandwidth usage on a web page for you to access from anywhere on your network. This will eliminate the need to remote desktop into your WHS server to view your usage.

Luckily, most times, WHS will prompt you immediately to allow the application access through Windows Firewall; if not, follow the instructions in some of the other articles here for WHS. With the default settings below, you will only be able to access the web page from inside your network.  You can add IP addresses to the Filter if you wish, however, I didn't.

You have to remember to forward the port in your Router to your WHS for this to work.