For those who can't sign in or sign up through the app, here is a possible solution. Go to chrome and type "Steam Account Sign Up" and click on the first result. Here login or sign up whichever you need and voila you'll be able to open your steam account. For new users, do remember to check your mail once the sign up is finished to confirm your e-mail's address. Once that is over you can normally login through the app. Also do not forget your steam Username becuz it'll be used on account login