Select Render WalkList Tours from the side menu and click the Edit button on the desired tour.

List Tours - click Edit button on desired tour

Go to tab Content / Logo.

Tour settings - Content / Logo tab

Upload the image of the logo and you can optionally choose to add a hyperlink to it.

Upload logo image and optionally add a hyperlink

Click Save on top of the page.

You can adjust the size and position of the logo inside the Editor UI.

Select Render WalkEditor UI from the side menu. Click on the Logo box.

Editor UI - click Logo box to adjust size and position

Click Save on top right corner of the page.