The system uses the NHL's official Injury list to update players' injury status.
MANAGING YOUR INJURED RESERVE (Custom Leagues Only)
Players who are eligible for the injured reserve (IR) are designated with an asterisk and an "IR," followed by a number indicating expected duration (in days) of the injury in red. To move a player on your team to an IR slot click on the "Manage IR" link at the top of your team page. This link will only appear in leagues which use IR slots.
IR-eligible players can only be moved to the IR slot from your active roster or bench. Players can not be added directly to your IR slot from free agency, as you must first add the player to an open bench slot.
To move a player from your IR back to your active roster or bench, click on the "Manage IR" link at the top of the Team page and activate the player.