Check this link for more details on
https://docs.meridianapps.com/hc/en-us/sections/360006480194-Configure-Aruba-Hardware
Aruba tag app is used to configure tags on map similar as Aruba Beacon app and view it on maps.
Meridian editor is cloud solution, you can create your own app or purchase from Aruba meridian who will develop App based on your requirements.
You need to first purchase meridian subscription and also have Aruba WLAN infrastructure to integrate Asset tracking.