i have many problems with this power, so, how works?

from what I understood (corrections are welcomed, by the way) -

I have Hawk and someone has Spoiler -
I announce Hawk to attack Spoiler -
then the opponent will say Spoiler to use her CR -
then I used Hawk to attack Spoiler -
Roll dices and make the hit -
two damages granted to Spoiler -
She still have a CR on her dial then
the Spoiler moves back two spaces.

right?

im pretty sure you have to LAND on a click with Combat Reflexes on it to use it.

I mean you have to get hit click your figure, and then if your on it, you can use it.

Because Damage is dealt to a figure, THEN he gets knocked back, THEN he takes knockback damage, in that order, So if you have Impvervious (V Ult Captain America) and you get hit for 3, and miss impverv with cap, you click cap one time, putting him on a combat reflexes click, then you choose to move cap, away from the attacker, 1 square, for the 1 damage being dealt by the attack.

But, you must Have combat relfexes ON the dial, AFTER you click the damage dealt, to use it

Then why are there figs with it on their first click?

Combat Reflexes has two components.

1) Automatic knockback when the character takes damage from an attack.

2) Reduces knockback damage to 0.

For Part 1 to activate: check the character for CR prior to the attack roll.

For Part 2 to activate: check the character for CR when it is dealt the knockback damage.

So 3 examples:

1) Hawkgirl has CR on her dial. She wants to take knockback so leaves CR on. She is attacked by a successful roll of 7 and takes 3 clicks of damage. She applies the damage. Because CR was on before the dice were rolled she is knockedback 3 squares. CR is gone now, though. She hits a wall...now she is dealt 1 click knockback damage which she takes because CR is gone.

2) Hawkgirl with Willpower on her dial. She is attacked on a successful roll of double 4s. She takes the damage and is moved back due to the roll. She has CR on her dial now. She hits a wall. That damage is reduced to 0 because CR is now present on her dial.

3) Hawkgirl has CR on her dial. She wants to take knockback so leaves CR on. She is attacked by a successful roll of 7 and takes 1 click of damage. She applies the damage. Because CR was on before the dice were rolled she is knockedback 1 square. CR is still present on her dial. She hits a wall. That damage is reduced to 0 since CR is still present on her dial.

Unless she was already next to the wall 1 damage wouldn't knock her into it.

Everything else is correct as far as I know.

I had Spoiler on a roof next to the LE Zatarra Zatanna. My opponent did a forceblast which pushed Spoiler off the roof. Does combat reflexes reduce the 2 clicks damage from falling off elevated terrain to 0?

That's where she was in my head. (I wanted to drop her damage taken since she doesn't have that many clicks of CR and I just know someone would be like...Hawkgirl can't do that if I left the number too high.)

Assuming Spoiler has it when she is dealt the 2 clicks of damage for being knockedback off of elevated terrain then yes...the damage dealt is reduced to 0 by her CR.

Clear....Thank you!!