Hi @Inferno.
To complete the challenge click the “Run the Tests” button below. If it doesn’t take you to next challenge, please click the curriculum button, where you’ll see challenges. If you completed the first one, it would be ticked.
And try to use Chrome or Firefox as you browser.
Edge is known to have problems with several of these challenges, and this is one of the problems we’ve seen. Chrome, Firefox, and preview (Chromium) releases of Edge are all known to work.