First and foremost, the goal is to play with the software to become familiar with the layout and features before the day of the exam. You should practice typing in the answer fields (where applicable), scrolling between questions, and selecting different menu options. You should also practice saving/uploading the answer file. This is an opportunity to gain comfort and ensure any potential issues or questions are addressed before the exam.
If you have any questions or technical challenges, please feel free to contact ExamSoft directly (phone and email info is available at www.examsoft.com).