In the first task "Wellcome!" the page keeps loading, and it won't let me do anything.
I have already updated my browser, and i run macOS Sierra V. 10.12 (16A323) (the newest). I have deleted my history, cookies and all programs like AddBlock. I have whitelisted all the websites that the Q&A said.
It's the first step, so it's to early to write codes
I would expect that the loading symbol would disappear
Please help. I don't know what to do. -Johannes