To add/change the company logo on your website...
Step 1: From the Website backend, click on Website in the top navigation.
Step 2: Click on Theme Prefs on the left-hand side.
Step 3: You'll see a section labeled My Logo. Click the Upload your logo link.
Step 4: Click on Add New File or select a file you already uploaded.
Step 5: Click Browse to find the file you want to upload as your logo. Once you find it, click Upload Files. You'll end up on the screen in the previous, select the file you just uploaded and click OK.
Step 6: You'll now see your logo in your site preview to the left. Use your mouse to drag it to the desired area of your site header.
To remove your logo at any time, simply un-check the Include my logo check box.