Try reset it yourself:
With ignition on but engine not running press and hold the left hand button on the cluster for 10 seconds,
This brings up a series of icons in the information panel of the cluster.
If you get a series of numbers and letters come up just turn off ignition and start again.
Release and hold again to scroll through the service items until you get to the one you want to reset.
As the item you want to reset comes up hold this button for 3 seconds until a message " reset " comes up release and hold button again for 3 seconds and the item is reset.
These resets are hard to operate and do require some practice to get them right.
If that doesn't help, you will need a BMW Scanner 1.4.0 or 2.0.1 to turn it off. It is easy. But when the light comes back, you should take it to the dealer or mechanic.