App will not recognize my log in

I signed up for an account and tried to log in and the H&M app refuses to recognize my username and password combination. Ive used a computer to change the password, deleted and redownloaded the app, performed a forced shutdown and reset of my phone. Nothing is working. All I want is to set China as my country (not available as an option on the app either!) and link my shopping cart on my computer to my phone. Neither can be accomplished. Deleted app and shopping will not continue!

TPSW, KBM about H&M