How to remove crucible node on console?

Recently I bought a bow on the trade market. It had a crucible tree from before, with a crit node. I'm using precise technique so crit chance is useless to me. But if I were to remove that node and path to two others, I could get a little more elemental damage from a 15% explicit modifier. But how is it possible to remove that node on console? I know it's supposed to be possible with a scouring orb, but how do we in practice do it? The Crucible UI covers basically the whole screen.