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There are many clickable items in the dashboard, the most useful is usually to click the number under the "Test" column of the tests you want to see (usually failing tests are the most interesting to probe, so you'd click the number in the "Fail" sub-column). This will take you to a page with some data about the test run at the top and a list of tests that had a specific result. The most useful data at the top of the page is presented in the Out-of-the-Box (OOTB) field named "OS Version." Jim Foucar configured this field to display the sha1 of the commit that was tested (it is not possible to rename the field though). Below the general information is a list of tests, and again, there are many clickable items. The most useful clickable item for a test is it's Status field. Clicking this will take you to the TestStatus.out data for the test, which should help to give you some clue as to what happened.
If "0s" is in the "Time" column, that usually signifies a build failure, as opposed to a failed test.