STEP 1 – click on your chosen time (book up to 1 hour a day, up to 7 days in advance)
STEP 2 – Your booking will be confirmed and pin code displayed (confirmation also sent as email)
STEP 3 – Arrive at the courts in time for your booking. Enter you pin into the keypad at the entry gate at the time of your booking (code becomes live 10 minutes before your booking.

Different ways to book:

LTA: https://www.lta.org.uk/play/book-a-tennis-court/

Clubspark: https://clubspark.lta.org.uk/ParksTennisinGreenwich

Booker app: https://clubspark.com/news/booker-app (Easiest and quickest way plus it will store your pincodes)