For parametric parts, pads are automatically created. However, once you have fully created a parametric part you can add additional pads.

You can add a pad by clicking a pad in the group in the Add menu.

Click to toggle between and

TPH Pads

Click to add a rectangular TPH pad.

Click to add a circular/elliptical TPH pad.

Click to add a polygonal/curved TPH Pad.

SMT Pads

Click to add a rectangular SMT pad.

Click to add a circular/elliptical SMT pad.

Click to add a polygonal/curved SMT Pad.

If is visible  it sets the size of pads added. So when pads are added they have a fixed size. If it is not visible then you define the pad sized by dragging the mouse to define the pad size.

is used for setting pad number.