I'm not sure if there is anyone to help with that from SmartBear, but I've added a link to their support portal below.
For self-help, the Help files are good and there's a "Start here" section that might answer your questions. I'll list each link in that section below for you:
About Zephyr Scale: Welcome | Zephyr Scale Cloud Documentation (smartbear.com)
Installation: Installing the App | Zephyr Scale Cloud Documentation (smartbear.com)
Enable Zephyr Scale in Jira: Enabling the App | Zephyr Scale Cloud Documentation (smartbear.com)
There's also a 1 hour training video here: Academy | SmartBear Software
Here's a link to the SmartBear support portal: SmartBear Support
I hope that helps.
Andy