Form is not displayed on the page

Hello!

I created form and inserted it on the page of my site.
[NEXForms id=”1″]

But form is not displayed on the page.
I would like to buy this plugin, but please help me to make it work.
Page is http://dev11.testmatick.com/project-estimation/

https://wordpress.org/plugins/nex-forms-express-wp-form-builder/