See how to change the title, description and logo of a SharePoint site so the appearance of a SharePoint site matches your corporate identity with this end user SharePoint Tutorial shows.
Changing the title of your site has an effect on the display title you can see on your browser tab. Please note that changing the title in a publishing site is different and usually requires you to directly edit the site and enter the title there.
How to change title description and logo of a SharePoint site
In order to change the logo of your SharePoint site you need to store an image for example in the Site Assets gallery. If you want to link to that image you need to copy the URL by hand since you can't select it later. Go to Site Actions > Site Settings and Title, Logo and Description to change them. The URL of the logo can be set using a relative link.