Handmade Theme --> social share icon (overlay section)

Hello -- I'm playing with the Handmade theme (https://www.balbooa.com/showcase/select-gridbox-theme/handmade) and I can't figure it out the social share icon function -- when clicked, it activates full backdrop section with social icons (fb, g+ and twitter) --> I'm editing that icon but I can't find any intel on how this is triggered (via button) I see class "ba-pull-right" under advanced and that's about all... please shade some light -- thanks!!

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