ZBrushCentral

Newbie question

First of all , i just started using Zbrush and i know almost all the basics.
So my question is how do i select my 3D sphere again after i clicked “draw” , i tried selecting it from the tools but i didn’t work.

Please help

Thanks

http://www.zbrushcentral.com/showthread.php?15941-Why-can-t-I-edit-my-object-anymore