The link you will have got inviting you to register for the On-line booking system doesn't make it very clear that you only register ONCE and then after that you need to SIGN IN on the right hand side of the screen rather than re-register. Once you have registered and signed in then you should be able to book courts without seeing the dreaded padlocks.

It would also be most helpful if you could add participants to your booking as this makes it much easier for the club admin. staff to fill in some statistical information for NNDC regarding court usage.

Thank you for your help.