MNHTN Theme - Sidebar Navigation
First, select the current navigation widget installed and remove it from your Muse canvas. This will allow us to update this widget to it's latest version.
Replace the deleted widget with the new version of the widget. To ensure that you have the latest version installed in your library you can download it here.
Use the file selector to place your logo into your menu. If you do not wish to use a logo on your menu, skip this step and move onto Stage 4.
From the master page of the Mobile layout, go to Page > Page Properties > Metadata and remove the text that is highlighted below. Click Ok.
Preview your page inside Muse and the old logo will now be removed and will be replaced with your new logo.