Prerequisites
You must be
an admin of the Confluence Cloud instance
either a technical contact or billing contact of the Confluence Cloud instance
To verify your Atlassian contact, log in to MyAtlassian and ensure the Confluence Cloud instance appears in the Licenses page.
Guide
choose the Confluence icon in the top-left corner
go to Apps > Find new apps
When the Find new apps screen loads, locate "Scaffolding Forms & Templates for Confluence Cloud"
You may have to omit the term "Cloud" from the search to find the add-on.
choose Install (or Free Trial if the app requires a paid license) to download and install
If the app requires a paid license, you will be provided with a minimum of 30-day free trial.
choose Close in the Installed and ready-to-go dialog box