You're right that is missing from our online documentation. Sorry about that!
At the test method level you can declare a Find attribute like this:
public void DownloadTest()
Within your code you reference these Find expressions by it's key like this:
The documentation on the new FindExpression's, which is what the Find attribute uses, is here
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items