Connect jquery file to Nintex form

To expand on what Simon said, there is actually no need to import jQuery into Nintex Forms Classic as it's already packaged in. 

Instead of calling it with the $ variable, you will need to use NWF$ instead 

/* If I wanted to create a jQuery Object of all the elements with the class "myClass" */

NWF$(".myClass"); 

Using the out of the box form, we have one jquery file for newform.aspx and one for editform.aspx.  Is this not necessary when connecting to a Nintex form?  Also, it appears we have to rename everything to the "nf" version, etc.  Correct?  Thanks for your help.

For a Nintex Form (in Classic Mode), if you have custom code that you'd like to use with the form, you can drop it into either the Custom Javascript area in the Form Settings: 

Or you can expand the Advanced menu and use a URL to point directly to a JavaScript file somewhere: 

If you have that pre-made JavaScript already sitting around, and it uses Jquery, you'll need to convert every call to jquery that uses the "$" variable so that it reads "NWF$" instead, or add something along the lines of: 

var $ = $ || NWF$;

to the top of the file / code, which would allow you to maybe get away with not changing every single instance of the $ variable. 

I hope that this helps.