In case you have trouble registering..
Go to bilibili.com to make an account there.
• First select your country and enter your phone number. Then press the pink button next to it to receive a text.
• Type the code there below your number.
• Enter a password then press the pink button to register.
• Once you made the account, your account name/ID will appear as something like this:
123456789012_bili. Copy this.
• Now open your game and paste your acc ID and password to login.
Done! Enjoy the game!