Open admin.google.com from your browser and sign in as an Administrator
Navigate to the GSuite Marketplace (this can be done by going there directly or through your GSuite Admin Panel > Apps > Marketplace Apps > + icon in the top right of the tool bar).
From the menu of the Marketplace search for "CloudManager" and click on the tile shown:
You'll then be brought to the CloudManager app page, from here you can either install the app if you haven't already, or launch the app itself.
If you're installing the App you'll be asked for confirmation to install the App, when you click confirm you'll be asked to enable the permissions required for CloudManager to work on your domain.
Once you've agreed you should get some confirmation screen within GSuite with 2 pages saying what to do next
Once you've read over the information and are happy you can now go into CloudManager from the Launch Button, via URL or through the app launcher in GSuite
After you have installed it:
To open via the Google App Launcher
Top right of your browser window.