How to add authority management to my Wekan


When I installed Wekan on my Ubuntu 16.04, I want to add some authority management to the card. Each card can only be modified by the creater, but I cannot find this option anywhere. How can I add this function to my Wekan?
Thank you for your help.
I am not a English speaker, I can read but write not very well. Sorry!


Please see it this is already requested at GitHub issues, if not then add new GitHub issue.