Drupal 7 add help text to a form item

I would like to change the help text of an input field. My form id is views-exposed-form-events-page-1. I have a text field that I want the helpful hint to appear below. The field id is edit-field-event-date-value2, I think, based on the html. <div id=”edit-field-event-date-value2-wrapper” class=”views-exposed-widget views-widget-filter-field_event_date_value2″> <label for=”edit-field-event-date-value2″> From </label> <div class=”views-widget”> <div id=”edit-field-event-date-value2-value-wrapper”> <div…