select to populate the menu from the database.
choose the first name column for both the label and the value
this will set the code for the options to look like:
<option value="<?php echo($row_WADADynListpcms2_users['UserFirstName']); ?>"><?php echo($row_WADADynListpcms2_users['UserFirstName']); ?></option>
you will need to edit the code manually to:
<option value="<?php echo($row_WADADynListpcms2_users['UserFirstName']." ".$row_WADADynListpcms2_users['UserLastName']); ?>"><?php echo($row_WADADynListpcms2_users['UserFirstName']." ".$row_WADADynListpcms2_users['UserLastName']); ?></option>