You can register on Online IQRA by just clicking the sign up button & by inputting your name & email id with your preferred password. You can check the box of I accept to the Terms & Conditions & Privacy Policy after going through them & Click Register.
Note: If you are using a laptop or a Tab then the sign up button is located on the top right of the screen. If you are using a mobile phone then its located on the bottom right of the screen.