Welcome!
I hope you enjoy your time here! To test the block function, you first need to request to be an admin here: https://publictestwiki.com/wiki/TestWiki:Request_permissions
A bureaucrat should get to your request soon enough (I'm not a bureaucrat right now so sadly I can't promote you) then go to any user's contributions page and click the block user link. ApexAgunomu (My changes here | Drop me a line) 16:49, 22 April 2022 (UTC)