[Closed] how to scale part of an object

scale its verticies

Objects can be controlled through subobject modes.
For Editable Polys and Editable Meshes exist an Vertex submode(small point thingies). Select them, scale them.

What do you mean? I’m a rookie.
All of us were at some point. Do your homework, if you want to succeed. It’s the most basic stuff you are asking for.
Try Help->Search->Vertices.

Working through the shipped tutorials helps a lot(so does posting in the right forum).