How do I add an icon to my footer (theme Streamline)

[evamoon]

I am trying to find a way to add an icon to my footer on my website. Does anyone know how to do this? My theme is called Streamline.

The icon I want to add is a logo.

Thank you in advance.

[evamoon]

Where do I do this?

[Ujjaval]

@evamoon 
you can add other logos like social media in streamline theme at footer but there is no any site logo in this theme at customize section.
online store->themes->customize->footer

[evamoon]

Is there not a way to add code so that I can add a logo?