Bluestack Whats App Help

I am trying to select all my contacts to broadcast to them but i have to tick the names one by one and since right clicking is not possible, it is just so hard. so if anyone knows a trick to highlight or select all my contacts or even addons from bluestack(already tried screen keyboard addons with ctrl keys) ,but what i do now is i click the down arrow and then enter repeateadly to select contact but that so slow and sometimes it even unticks all the contact because i try to tick so fast with down arrow and enter. i would appreciate it if anyone can help