Adding the Form Block
Go to the page where you would like to add a WordPress form created in the JetForms tab. Open the page editing window and press the “Add Block” button. Find the Form block and click on it to add it to the page.

Proceed to the settings in the right-side column. Open the Choose Form drop-down menu in the Form Settings section and choose the WordPress form you’ve created. The forms are listed by their titles.

That is all, the WordPress form is now on the page. You can set some additional Form Settings and do some appearance changes in the Block Style tab.

How to Add JetFormBuilder Form to Elementor?
To add the JetFormBuilder form in the Elementor page builder, just go Edit the page with Elementor, find out JetForm widget, choose the form you want to add, and place where you need. To find out more, please follow this tutorial.