Why do you not want to answer this thread?(Your answer will be sent to Jeanette and Aytekin)
Can it be used in Wordpress without a plugin?
Yes, JotForm is supported in WordPress, please review our guides here;
1) Adding Forms to WordPress.org Version
2) How to Embed Form to WordPress.com
Will let us know if you need further assistance on this, we would be happy to assist you further.