For the new members who joined the forums recently, the game is currently under development
so it's still ain't finished yet. For that, the developers gave us a chance to try out the game for a period of time on weekends called the Open Server Weekend (OSW)
for the purpose of server stress test and implementing new features from time to time.
Unfortunately you've missed the previous Open Server Weekend on August 8-10th
Don't worry, there will be another Open Server Weekend and it will be announced in the forums by the developers. Nobody knows
when will the next OSW so be patient.
All you have to do now is to wait for an announcement from the developers in the forums, and you could have the chance to play the game!
Hope this answers all of your questions.