Cancelling a request
You can cancel a request you posted yourself — "Cancel request," right there next to it — as long as it's still open. Once it's matched (an offer's been accepted), there's nothing left to cancel; the trade has already happened.
Cancelling closes the request. Any offers teammates had already made on it can no longer be accepted — if you still need out of that week afterwards, you'll need to post a new request.
If you're not sure whether a request is still cancellable, check its status: open means you can still cancel it; matched or cancelled means it's already settled one way or the other.

