The next task you will perform in order to customize your Magento store's look and feel is to change your Magento theme's logo. Firstly, you will need to upload your store's logo file to your store, in the /skin/frontend/default/m18/images directory of your Magento installation.

Now, log in to your Magento store's administration panel and navigate to System | Configuration, and then to the Design tab. Expand the Header panel as shown in the following screenshot, and enter the value of your logo file's name and your theme's image directory. In this case, the example uses images/logo.png because the theme's logo file is stored at /skin/frontend/default/m18/images/logo.png.

Click on the Save Config button in the top-right corner of the screen to save these changes. After refreshing your store, your new logo should appear in place of the default Magento logo: