Blender QuickStart Modify/Sculpt/Change Objects
The Blender Tip Show How-to Getting-Started Edit/Modify/Change/Sculpt an Object Shape or the Cube on the 3D Blender Scene.
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On Bottom Left >> Select Edit Mode
Or Simply Hit the Tab Key to Toggle Object/Edit -
Right-Click on Vertex to Select & Drag to Start Displacement
Then Left-Click to Place It