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Unless you are the theme developer and/or you are learned in writing a child theme with WordPress API to add code to your site, you can’t. There is no simple ‘layman’ way to do so.
As this appears to be someone else’s theme (and if no I apologize). I would contact their support and ask them the steps to do it. We typically do not support theme users and Redux is a developer’s product, not a commercial one.
Good luck.