Once a team has been approved by FIBA the team manager will have access to the challenger pre-registration.
The animation below shows the process for pre-registering to a challenger.
Important: A team can only pre-register and annul an existing pre-registration once per Challenger. However a team can start direct negotiations with the organizer or FIBA to gain a Wildcard slot.
Do also note that in case 2 or more Challengers happen on the same date, each team can pre-register to both of them but during automatic allocation they will only be able to get maximum one challenger allocated and will be skipped for the second Challenger.