Change the content and CSS ID of the "in memory of" prompt.

change_in_memory_of.html

<!-- Style and script to change the contents of the "in memory of" message
     on a Salsa donation page.  See (SalsaCommons link here.) -->
<style type="text/css">
  #was-in-memory-of {
    padding-top: 20px;
    font-size: 12pt;
    color: red;
  }
</style>
<script type="text/javascript">
  $(document).ready(function () {
    var your_label = "Whatever";
    $('strong:contains("in memory of")')
      .parent()
      .attr('id', 'was-in-memory-of')
      .html("whatever")
  })
</script>