To Place a Parametric Sphere

Select the Sphere Feature tool.
Enter a data point to define the sphere's center.
If Radius is off, enter a data point to define the radius and the direction of the axis.
If Radius is on, enter a data point to define the direction of the axis.

Placing a parametric sphere in an Isometric view, with Radius off and AccuDraw set to Top orientation. Define the sphere's center (1), then its radius (2).