i wanna add a spring arm to the head but i dont do anything mabye sameone can help
Hey @ShamianAT!
You can use the “+Add” Button above your hierarchy there to just add another springarm. The inherited one can just be ignored, after that. 
Pretty typical to do so with any of the components, don’t worry! Worry about it when you’re ready to ship and may need to edit it in C++ to remove the old springarm for the INCREDIBLY SMALL footprint.
Hope that helps you out!
If you want it directly attached to the head:
make the Mesh its parent, open the skeletal mesh and add a socket on the head, save the skeletal mesh, then finally change the parent socket here.