<?php echo stripslashes(get_option('gaaf_field_name'));?>
Note: Pick the name of textbox from markup <input type="text" name="field1" /> and enter them in above field as comma separated. e.g. field1, field2 etc.

<?php echo stripslashes(get_option('gaaf_field_class'));?>
Note: Pick the class of textbox from markup <input type="text" class="field1" /> and enter them in above field as comma separated. e.g. field1, field2 etc.

<?php echo stripslashes(get_option('gaaf_field_id'));?>
Note: Pick the id of textbox from markup <input type="text" id="field1" /> and enter them in above field as comma separated. e.g. field1, field2 etc.