I was just looking for that earlier today, it is buried on page 1,923 of the rule book!
"Players who are eligible for the Injured Reserve (IR) are designated with an asterisk and a "IR" 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 slot(s).
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."
So, it isn't like some leagues where you can just stash a player or two. Oh well, that's cool and good to know up front.
I haven't liked ESPN FF in the past, but it seems as though they have made adjustments. I'd say it is just as good so far as NFL.com.....gotta see how the live scoring goes. Great so far though
Arian Foster will be injured by week 4. Probably a hamstring. Just sayin....