The MP that Tao pointed you towards (https://www.opslogix.com/download-ping-management-pack/) is a SCOM management pack that will allow you to create ping checks to and from specific end points.
It sounds as though you have downloaded a dashboard for version 2 of Squared Up – Version 2 uses .xml dashboards, whereas version 3 uses .json, meaning they are not compatible with each other.
From what you have said, you simply need to create a new performance tile with the node as the scope, and the metric as Response Time (ms). Let us know if you need more info