WordPress is most popular CMS in the world, and to track the conversion you do need thank-you page. Sometime its really difficult for non-technical people to implement it, so here is comprehensive step-by-step guide to add thank-you page yourself.

2 most popular plugins:

–  cformsII

–  contact form 7

Download the tutorial: how to create thank-you page for cformsII

Download the tutorial: how to create thank-you page for contact form 7