The skeleton is relatively simple to use
Activate the skeleton with the Activate Toggle and point the raycast where you want him to appear. This by default is from the Right Hand but can be changed in the Position Submenu. Use the placement hologram to see where it is going to be placed.
To rotate the placement hologram tilt your hand left/right, like turning a key in a lock. You should see the placement hologram rotate when you do so.
To Place the skeleton toggle the Dropped Toggle.
To make the skeleton Appear, Toggle the Appear Button, it should make the skeleton appear and then turn itself off after a short bit.
Active - Activates the asset. A hologram only you can see will appear while not dropped to indicate the where the skeleton will appear.
Dropped - Drops the skeleton plane into the world. This is NOT late joiner synced so users who show your avatar after placement will see the skeleton in a different place.
Position SubMenu - submenu with options that change the position from where the raycast to place the skeleton originates.
Appear - Makes the skeleton appear and run across the placement spot