Hello there,
Thank you for creating a topic on our support forum.
Currently logo is added to footer using Text Widget in Appearance -> Widgets. So all you need to do is to upload new logo image to the server, copy it’s path and replace it in Apparance -> Widgets -> Footer Column 1 – Text Widget. See screenshot
https://gyazo.com/9e73568821d3b4ad4306675b06b5c87c
Kind regards,
Xtemos