Navigate to the Atlassian Marketplace https://marketplace.atlassian.com/apps/1235583/itdocs-now-cw-company-and-config-info?tab=overview&hosting=cloud , select the button Try it free and follow the dialog to select your cloud instance.
or
To find and try new apps:
Select the wheel icon
in the top-right corner to open Confluence administration.Find Settings in the left-hand navigation.
Select Atlassian Marketplace > Find new apps and type ‘ConnectWise’.
See https://support.atlassian.com/confluence-cloud/docs/manage-your-apps/