We have lots of resources on our blog that may be able to answer your questions. If you can't find the answer there you can try these forums:
Many GRE and GMAT questions have been asked and answered here. They're great resources; simply type in the first several words of your question and see what comes up! You can post your questions there as well, and most likely have it answered by another user!
If you can wait a few hours, let us know by using the Help tab! The Magoosh office is located in Berkeley, California, so while some of us might be asleep when you send in a question, we'll response as quickly as we can! We have tutors working in many time zones, so ideally you'll get a response within a few hours.