Your store uses a few different logos in different places. Set them all in Customize › Theme Settings › Logo Settings.
The four logo slots
Logo (Header). The main logo at the top of every page. You can also pick a Logo size: Small, Medium, Large, or Full.
Logo (Footer). A smaller logo shown in the footer.
Logo (Login page). The logo on your admin login screen.
Logo (Admin panel header). The small logo at the top of the admin, with its own size option.
Uploading or changing a logo
Go to Customize › Theme Settings › Logo Settings.
For the logo you want to change, click the image to open the media library, then upload a file or pick an existing one.
For the header and admin logos, choose a Logo size that fits.
Click Update to save.
Tips
Use a transparent PNG or an SVG so the logo sits cleanly on any background.
Upload at the size shown next to each slot or larger, never smaller, so it stays sharp on high resolution screens.
Keep the header logo simple. It has limited height, so very detailed logos can be hard to read.
Site name and icon
Your site title, tagline, and browser icon (favicon) are separate from these logos. You set those in Customize › Storefront › Customize › Site Identity.
Need more help?
For anything that does not match the steps above, message us in the chat from your admin or open a ticket from Help › Support.