Note: We are not going to use SharePoint Online Management Shell ;o) instead we will use Windows PowerShell.
- Install PnP PowerShell Cmdlets for SharePoint Online
- Perform a quick test: Run the command below in Windows PowerShell to see if it is available
- You are done. Now browse the site and you will get the annoying Hello World alert on all the pages.
Ref: Introduction to PnP PowerShell Cmdlets
Ref: OfficeDev/PnP-PowerShell Reference