You can customize the footer in your FromThePage collections via the settings tab.
A simple footer can just be text containing your institution name and how to contact you.
You can also use HTML in the footer field. For a good example this page on the County of Los Angeles Public Library.
The following is the html code, with references to external images, that created the footer.
<a href="http://www.colapublib.org/"><img style="float: left; margin: 0px 15px 15px 0px;" src="http://www.colapublib.org/images/logo/librarylogo_115x115.png" alt="library logo" width="100" /></a>
<a href="http://www.lacounty.gov/"><img style="float: right; margin: 0px 15px 15px 0px;" src="http://www.colapublib.org/images/logo/countyseal_115x112.png" alt="county seal" width="100" /></a>
<h2>County of Los Angeles Public Library Transcription Project</h2>
<h4>Help us transcribe historic California letters in our American Indian Resources Center </h4>
<p><a href="http://www.colapublib.org/testing/mary/about.php" target="_blank">Getting Started & Transcription Tips</a> |
<a href="http://www.colapublib.org/" target="_blank">County of Los Angeles Public Library</a> |
<a href="http://www.colapublib.org/resourcecenters/airc/index.php" target="_blank">American Indian Resources Center</a> |
<a href="mailto:digitalprojects@library.lacounty.gov" target="_blank">Questions? Contact us</a></p>
<p><a href="https://www.facebook.com/LACountyLibrary" target="_blank"><img src="http://www.colapublib.org/images/facebook.png" />/LACounty Library</a>
<a href="https://www.facebook.com/AIRC" target="_blank"><img src="http://www.colapublib.org/images/facebook.png" />/AIRC</a>
<a href="https://twitter.com/lacountylibrary" target="_blank"><img src="http://www.colapublib.org/images/twitter.png " /></a>
<a href="https://www.instagram.com/lacountylibrary/" target="_blank"><img src="http://www.colapublib.org/images/instagram_32.jpg " /></a>
</p>