This will allow you to add your company logo to the top of all the Share Point Foundation sites with a description if you choose to include that.
1. You will need to start by navigating to your SharePoint URL. (team.website.com) Followed by logging into your SharePoint site with the administrative credentials.
2. In the upper LEFT hand corner click on Site Actions then select Site Settings.
3. Under Looks and Feel click on Title, Description, and Icon.
4. Fill out the form accordingly and press OK.