/op command,admin role.op <username><username> with the exact player name.op <username>is equivalent toplayer <username> role admin.
/AdminPassword <your password>, then use the slash form: /op <username>.player <username> role <rolename>role (or /role in-game) to list the available roles and pick the defaultdeop-style workflow via the role system if youradmin (standard admin) and sysadmin (higher)./op grants admin, which is enough for normal server management./role <rolename> privilege [grant|revoke] <privilege> if you want to