Does your account have funds on it? Follow the instructions to put funds on your account. 

Have you taken the assessment survey to place into the correct level? If you have not, you can do this by logging into your account and following this link to the survey: 

The final reason you may be ineligible for a session is because you have taken the assessment survey and placed in a specific level. The assessment survey is used as a benchmark to determine which level fits you as a player, however, if you feel you have been improperly placed in to a level you can submit a change level request form.