Bone INfluence tool (changing the settings)

IM trying to experiment with the bone influence too on my animation. I hace the choice between, infinite and elliptical. However, the instructions dont tell me how to switch between the two…

"By default, the zone of influence remains invisible, as the Influence type is set to Infinite in the Tool Properties panel. If the Influence type is changed to Elliptical, the zone of influence will appear as a large ellipse"

Does anybody know where in the menu I can go to change it from Infinite to ellipse?

You need to select the specific bone underneath the bone group and then in the
"Properties" window you will see a drop-down menu where you can change the default “Infinite” setting to "Elliptical"

All this is explained in more detail in the Help manual on page 274 “Setting the Influence Area”