custom query filter for event

Im quite new for this tool and just want to ask a very basic question.
i have “VisitorID” in “Events” table and want to display its data with other event’s data.
How can i do that?
I know my help/guidelines are still somewhere in this link “
But i have no idea where should i change to get my relevant results.
Can u guide me which files should i use for this purpose ??
Thanks in advance

If you are using standalone version - you can define new template on the same page where scheduler was initialized

If you are using plugins - templates can be defined in admin part of scheduler.