Your store logo is usually an image .png or .jpg format
shown to your customers in Storefront, invoices,
Step by step
Go to Design → Templates
Select your current template
Click the Edit button to see template settings
Upload a new logo or select exiting in Resource Library
Save the settings
at the bottom of the page
Starting AbanteCart version 1.2.11 you You can upload different logos for storefront theme and emails sent to customers.
For the storefront you can use image or HTML resource logo however for email it is strongly recommended to upload an image image file png or jpg format.