ZBrushCentral

How to make an object editable again

Hi everybody! I am a beginner and wonder how to make the object among the others on canvas editable. I noticed that I only can edit the last created object but not the others next to it on the canvas. So how to make the object I choose editable? How to select it and edit it?

http://www.zbrushcentral.com/showthread.php?15941