The glass jar it’s in says to "keep refrigerated after opened," but it has no other instructions or a list of ways of how to drink it. Has anyone tried Classico before? How is it prepared??

i have no idea what that is, if you had a pic to work with, i can tell you more. the best I can say is to taste some of it. if it tastes like hot chocolate mix, then prepare as such, heat up some milk, and add in enough of the mix to prepare hot chocolate. or boiling water with a little bit of milk later on if you like hot chocolate that way.