how to use stiffener command in catia v5

Hi friend, good morning, I am attaching a picture, with some tips. try to make it, and let me know if you have problems.

To define some ways a stiffener:
from Side
from Top

When You get the Topologicat operation Error: Select the arrow or the Button "Reverse direction"

https://www.youtube.com/watch?v=xFWB2uf3dwI

http://catiadoc.free.fr/online/prtug_C2/prtugbt0506.htm

https://www.youtube.com/watch?v=H8m7jXz3S_4

http://www.catia.com.pl/tutorial/z2/part_design.pdf

thanks to all

you cant baby
'

Shakti I have a problem to create stiffener between rectangle & circle I will upload the images to you then you solve this problem