The RFID pill is that small (usually dark) glass capsule located in the half with the blade attached. In the pic you can see the pill in the upper right half of the housing.
Be careful removing the pill you don't want to break it. There is a small plastic "catch" that is partially over the pill that you can gently push over and help release the pill. I don't want to experiment with my keys but I believe if you push that catch over with the housing upside down the pill will just fall out. Do note which end goes where. I don't know if the position of the pill is sensitive but just to be safe install it with the same orientation in the new housing as it had in the old housing.
For the blade there is a block of plastic in the corner to the left of where the blade fits into the body that you have to push back just enough that you can slide the blade out. If you look directly down at the housing you can see some small shiny "sliver" of blade and the plastic block wedged against it to prevent the blade from coming out.
The end of the plastic block opposite from where it wedges against the blade has a small spring you can see. It is the force of this spring that keeps the block tight against the key and the key secure.