You can make reservations with the link provided with your registration confirmation.

Rooms at the block rate are first-come, first-served. We only have 1000 rooms and once they’re sold out, they’re gone.
The Resort Tower is nearly on top of the convention center. That is optimal for attendees to avoid as much smoke as possible by not having to traverse the casino floor to get to your room, which is what those who stay in the Jubilee Tower will have to do. But Jubilee offers righteous views of the Strip.

Cost is $95/night plus $15 resort fee/night plus 13% tax. You’ll have to pay the first night’s deposit upon making your reservation (they won’t charge the resort fee as part of your initial deposit). You can cancel for a full refund of your room deposit up until the end of October.