Rotating an Asset
You can rotate an asset by clicking on the 'Rotate' control in the Edit Controls.
When rotating, your asset will spin on the editing grid.
Imagine your asset is sitting on a lasy-susan (or another type of wheel) that is resting on top of the editing grid. You can spin the asset around on that axis.
So to make an object yaw (imagine nodding 'no') look at the asset from above.
To make an object pitch forward or backwards (imagine nodding 'yes'), look at it from the side.
To make an object roll (imagine tilting your head like you didn't quite understand what someone just said) look at it from the front.
Like moving, you can use the keyboard, mouse or numeric entry to update the values.