Hello,
You can add it manually through the code,
go to ftp > templates > your template > tpl > blocks > fields_search.tpl, fields_search_horizontal.tpl, fields_search_box.tpl
find a row {elseif $field.Type == 'select'} > next find an {else} block inside
change:
to:Code:Only registered members can view the code.
Code:Only registered members can view the code.