[AdamsLT]

To show that no admins are online you could add a bool variable that you set to true, if there are any admins online. After you finish looping through players you could check if the value is true, if yes - print the admin list, if not - print that there is no admins online.

Those errors you are getting are I think because you are using the wrong type of brackets. When accessing arrays use [ i ] not ( i ). So it would be PlayerName[i], ForumName[i], etc.