Thanks for reaching out and posting this question!
I was able to use the inspect tool on my browser to identify the app, and it looks like they're using Zendesk as suggested by @Taknify. If you need to get help with a third-party app, then the app developer is always available to assist you. Simply reach out to the developer using the contact information found at the bottom of their app's page.
If you have any other questions on this topic, then don't hesitate to let me know!
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