Use a correct address, the password will be sent there.
After you get your password via email you can log in any time.
you will find a list of programming tasks numbered A, B, C and so on. On Saturdays and Sundays, new problems will appear at 12:00 Central European Time, on workdays at 18:00 CET.
After logging in, if you click on the letters, the problem description will appear.
You have to submit the source code of your solution via the web interface.
If your program is in C, you need to add an "\n" to your outputs.
If your program is in Java, don't put it into a package. If everything is fine, you will get an "accepted".