How do I view and make new animations?

[LordOtto]

I have been trying to view the animations of already existing modded units and just can't figure out how to. I've been trying to use this https://www.dropbox.com/s/dwzbkpfpohnsxxg/3DTutorial-ToolsOfTheTrade.pdf?dl=0 but I don't know how to get to the 3d asset viewer that allows you to see the animations. What I am trying to do is learn how to make completely new animations and view already existing ones. Any help would be great.