Subaru BRZ 2017 Owner's Manual page 144

1-7. Safety information
Removing a child restraint installed with a seatbelt
Installation with ISOFIX rigid anchor (ISOFIX child restraint system)
144
Push the buckle release button
and fully retract the seatbelt.
Latch the buckles onto the exclu-
sive fixing bars.
If the child restraint has a top
strap, the top strap should be
latched onto the anchor bracket.