Hello,
First of all thanks for choosing our Theme, we are glad to be you in WoodMart WordPress family :)
For changing your logo you need to edit your default header from WoodMart >> Header builder.
Screenshot for clarification: https://jmp.sh/gFU87UV
Then edit the logo element and upload your custom logo for desktop view and then switch to mobile layout and then again edit the logo element and then upload your logo for mobile and save the changes.
Screenshot for clarification: https://jmp.sh/Cquv7lE
Best Regards.