Using this web application is very easy and once you understand the basic ideas, you'll have no problems in getting around.
I put together a list of Frequently Asked Questions (FAQ) but I highly recommend to first watch the Video Tutorials from start to finish.
I tried to give you there step by step all the information you'll ever need.
If you still have questions, please don't hesitate to contact me. I will be more than happy to reply to you in person.