Instead of adding to someone else's thread and messing up over there, I'm starting a new one as I work through this myself.
Taking Aaron's advice that he gave in this post: https://premium.wpmudev.org/forums/topic/paginate-marketplace-page#post-134141
I changed the array that displays my marketplace, but I'm still not getting pagination.
This is what I have now:
<div id="market-grid"> <?php $atts = array ( 'text' => 'none', 'paginate' => 1, 'per_page' => 16, 'order_by' => 'date', 'order' => 'DESC', ); mp_list_global_products( $atts ); ?> </div>
The main thing I did for the was to remove the 'page' command. This is in a template file called mp_global_products.php. It is located in my child theme folder (and I am using BP Corporate). I've experimented with setting paginate to true instead of 1 and I still got nothing.