How to make the chamfer?
The chamfer tool creates a beveled feature on selected edges, faces, or a vertex.
To create a chamfer:
Click Chamfer tool_Chamfer_Features.gif on the Features toolbar, or click Insert > Features > Chamfer.
Under Chamfer Parameters:
Select an entity in the graphics area for Edges and Faces or Vertex
you have angle distance or distance distance or vertex types in it.
click this tutorials basics would have been explained but in catia and creo
The chamfer around the outer edge?
1.Click Chamfer on the Features toolbar, or click Insert > Features > Chamfer.
Should be a simple solution, unless you're referring to the chamfer-like feature in the center of the object.
Youtube video for Chamfers:
SolidWorks chamfer description: