You can now book a time slot at the range on the Session Booking page in the members area.
This can also be found through the Members menu and will require the usual password for access.
The booking process should be straight forward. You should see a page like the picture below (there is also a link directly to EventBrite if the embedded page doesn't work for you).
You can filter the session times by date and then book a 'ticket' for a boss in a session at a time that suits you.
Normal lone shooting rules apply so you may need to buddy up with someone on Facebook to ensure at least two people are at the range.