The Bullet Physics in prior versions of Poser weren't meant to cloth people.  When you get the new version there will be a fourth tab for the cloth.  The point to review the videos was to see how the weight map painting is done.  That part remains mostly the same.  One of the biggest differences between the old cloth room and Physics Cloth is that with the old system you put a cloth on a person and hoped that it would stay in place.  With Physics Cloth you constrain a point on the cloth, and it stays where you place it.  There are several types of constraints but for cloth you are going to want to use animated constraint.  That way where you pin/attach the constraint to it will follow that body part.

In the videos they are using a cloth plane and painting the corners moving the 3D Jacks and the cloth follows the 3D Jack.  That is very much what the process is for the new Physics Cloth.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13, 14