How to edit curve on different plane?

I got a curve on xz plane,and can’t figure out how to deform it on another plane, xy plane. Apparently it was locked in xz plane. All the changes only apply on xz plane? Thank you.

Use the move/rotate/scale tool, or the translate tool in the transform menu.

Oh, i mean the control points on a spine. How to modify points on different plane? So i get the exact spine in 3d dimensions.

You can’t, currently we don’t support 3D splines. Although you could import one.