I’m frustrated

Trying to load Vocalizer Pro side chain in Logic Pro

I've successfully installed and activated Vocalzer Pro on my Mac and am now trying to load the audio track side chain in Vocalizer Pro according to the instructions.

It says to choose the audio sidechain track from a dropdown menu in the upper right hand corner of Vocalizer but there isn't a drop down.

Can someone please explain how this is supposed to be done?

A pic or video would be brilliant! :-)
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