You must log on as admin before typing admin commands. Both logon and admin commands have to be sent in the chat prefixed with a # 
(Note that some commands may be disabled depending on what type of server you have)

 

Command	Example	Description
#login password	#login adminPW	Log in as the admin
#exec ban (name, ID or Player#)  <May not be available in DayZSA>	#exec ban nickName #exec ban 47114712 #exec ban 3	Allows you to ban a player. Their ID will be added to the ban.txt
#kick (name, ID or Player#)	#kick nickName #kick 47114712 #kick 3	Allows you to kick a player