Username or password problem

As an absolute beginner managed to set up an account and get HA working and recognising some stuff - but got no further, unintentionally logged out of my mac / chrome browser, tried to log back in but got Invalid username or password - I am pretty certain I have both right but of course cannot be sure - not seeing an obvious way to get back to the beginning and access HA which is showing as connected on my router - please help but do not assume programming knowledge, thanks

Duplicate post.