How do you save server data on Datastore2?

I want to be able to save server data but I don't know how to do it with DS2. This is what I tried:

Test = datastore("Test","Server")

When I did that it came up with the error:

17:23:36.771 - ServerScriptService.DataStore2:483: DataStore2() API call expected {string dataStoreName, Instance player}, got {string, string}

Help Please