help with rigging helmet to Wolf

[Hggrundting]

I have just discovered how easy it is to import 3d meshes into this game, and i got around to tinkering with putting a helmet onto Wolf. i basically just uses the FLVER modifier program to move it onto his head mesh and thought that was that

Of course, me being a complete newbie, the helmet is not rigged properly and just kind of floats behind and inside of Wolf, how would i go about rigging it properly to Wolf's head?