First of all thanks for choosing our Theme, we are glad to be you in WoodMart WordPress family :)
To change the logo of your site you need to edit your header from WoodMart >> Header Builder >> Your default header >> logo element. If you want to change the logo for mobile, then you need to first switch to mobile layout and then edit the logo element and upload you logo and save the changes. It’s up to you that you used svg, jpg, png or any other format.