Have just taken a proper look - it's cool but I can't see a way to sign in. I made an account on my mobile but now want to access it on my desktop. I would have

Have just taken a proper look - it's cool but I can't see a way to sign in. I made an account on my mobile but now want to access it on my desktop. I would have assumed I'd just use the same email and it'd send me a login link, but I just get "this email is already in use"...