Adding Logo on Garden Plant theme

I’m building a www.remarpro.com website using the free Garden Plant theme. I’ve really searched the site, but cannot seem to figure out how to add my logo to my website. I’ve gone to appearance, then customize, but the “site identity” option doesn’t seem to be there. I assume this has something to do with the theme I’ve chosen and that the function is just located somewhere else withing the theme editor, but I’ve really hunted for it all over and still have come up empty. I would really appreciate some guidance towards figuring out how to add my logo. I’m pretty much in a holding pattern until I figure this out. Thank you.