Hi,
I’m sorry to hear that. The plugin does work so if it does not with you then there will likely be some javascript error on your site caused by another plugin or your theme.
I’ve tried visiting the page you shared but the page does not seem to exist, can you check for typos and make sure it is the right link please?
To troubleshoot this yourself:
The easiest way to see which javascript error it is is by checking the browser console. In chrome you click right on the page and then click inspect and then click console.
Otherwise deactivate all your plugins except gravity forms and this plugin. Then turn on plugin by plugin until the error comes back, then you know which plugin is the problem. If not a plugin, it could also be the theme so you might have to switch to a default theme for a minute to rule that out as well.
I look forward to hearing back from you and to get this fixed for you!
Kind regards,
Johan