You have to open the Configuration Engine and click on the Header item in the left side menu.
From the dialog, you have to select the Custom Code tab and click on the Custom Code radio button.
Since switching to custom code in the header will reset the default header that we provide, you have to paste the following HTML code in the HTML tab:
<div class="left"><a href=“url-to-your-home-page" id="logo"><img class="logo-image" src=“path-to-your-logo"></a></div>
<div class="right"><div class="js-culture-container"></div></div>
In the Custom CSS tab you have to enter the following code:
<HTML element goes here />
The empty style tag is required.
You can click the Apply button of the Edit Header dialog.
Before publishing the changes you can click on the preview button to make sure that everything is fine.
Also it have to be noted that the image for your logo have to be served from somewhere on your server.