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Customizing The Logo

Edit the logo from the theme header.

Go to WP Admin > Appearance > Headers/Footers > Header - Default Design, and open the header in the Live Composer page builder.
Open the "Image module" options panel (click on the "cog" icon). 
Upload your own logo. 

If you are using the "Logo module" in the header:

This article shows instructions for the scenario when an "Image module" is used for logo. In the case your header is using a "Logo module", to change the logo follow this path:  WP Admin > Appearance > Customize.