Select Services from the kapp menu.
Your request may be listed, if it is one of the top 5 most recently updated, right there on the lower left of the Services page.
If it is not, select View All.
This will take you to a list of requests where you can see the status of your request. To view more details about an individual request, click on it.
This will take you to the activity page where you can request cancel for your request.