The image assigned in your Admin area under the Site Logo field is used for the header logo and navigation logo.
Note: You can type in the name of a media file you have previously uploaded, or you can upload a new image and it will save the logo in your media files.
Logo File Type
It is recommended to use .PNG file version of the logo. A PNG file will allow for any transparency in your logo to show up.
Logo Size Dimensions
The demo logo that your site came with is 204 pixels wide by 60 pixels high. The logo size is set to a max width of 320 pixels wide by 90 pixels high.
Note: We recommend that you properly size your logo before uploading it into the site.