Beware, when signing up with my email the white overlay signup container became empty (full width, a few pixels tall, no content inside). I clicked outside it to close it, header still showing the blue login/sign up button.
Reloading the page showed me as logged in (my email in the header)
At every step, you need to run code to advance. On that page (https://futurecoder.io/course/#AddingStrings) you first need to run `'hello' + 'world'` in the shell as instructed. The next step is an exercise: you have to output the same thing with a space in between words, so code such as `'hello' + ' ' + 'world'` is accepted. The 'Next' button only appears at the end of the page.
You're not the first person I've seen get confused about this, I'll need to find a way to make it clearer that the interface is waiting for you to run something.
Beware, when signing up with my email the white overlay signup container became empty (full width, a few pixels tall, no content inside). I clicked outside it to close it, header still showing the blue login/sign up button.
Reloading the page showed me as logged in (my email in the header)