Drop down field

Hi,

Nice plugin. Thanks. I would like to ask, is it possible to convert one of the custom fields in the form, for example, custom field #4, to drop-down field, letting the visitors choose appropriate value, for example, city, town, etc.?
I’m trying changing the wpsb-opt-in.php file, but i only get the drop-down field with values in the back-end, not on the site. Which lines should i change to appear this on the site? I’m not very good at scripting yet…

Thank You all in advance.

http://ww.wp.xz.cn/plugins/newsletter-subscription-optin-module/