Use the Application Number you were given when you registered.
Most people finish in about 15 minutes. You will need an email address you can open right now. The form also asks about your family and the school you came from, so keep those details nearby.
Pick Junior High School, Senior High School or College on the front page. Each level has its own application, so check you chose the right one before you go on.
Open the Register tab. It shows each entrance exam with its date, its time, and how many slots are left. Choose one and click Click Here To Register. A schedule marked No Available Slot is already full, so pick another.
Type your email address and submit it. A verification code goes to that address, so use an account you can open straight away. After it is verified the address is locked to your application and shows as read only on the form. A typo here cannot be fixed later.
Read the notice and click I have read and agreed. The application form opens next.
Answer the questions about yourself, your family, and your previous school. A red asterisk means the field is required. You also choose your own password on this form, so pick one you will remember.
When you submit the form, the system gives you an Application Number. Write it down before you close the page. Then go back to the Login tab and sign in with that number and your password.
It is your username here. Your email address will not get you in. If you type the password wrong three times, a picture code appears. After five wrong tries the account locks for a few minutes, so wait for the timer to run out and try again.