FSL Flexible Auras and Halos

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Hello. I would like to create an aura around my characters with FSL Flexible Auras and Halos but it doesn"t work. Can someone tell me clearly how to use it ?
If I click for exemple on the arms and then select a shader of course it work but it's not around the arms. It's all the arms that become ilumintated not around the arms. Sorry for my bad english and Thank you for the answers. 

felis

This product https://www.daz3d.com/fsl-flexible-auras-and-halos

I don't have it, but it is a number of props with morphs and shaders.

What are you trying to do?