The site should automatically reassign it after some number of days. The reassignment time is in the failure email, if I recall correctly.
Depends on the exam. Some exams are not auto reassign. All rating exams are auto reassigning, some facility exams are set to not auto reassign.
Hiro,
The exam will be reassigned at the top of the hour following the date/time you took the test. IE, if you took it 1/5/18 at 1:25pm, and there is a 3 day wait, it'll be auto reassigned on 1/8/18 at approximately 2:00pm.