Can someone explains with his own words how to add key frames? The steps... (for example because I have tried this and is not working):

ADD BLUR EFFECT

1) Put the cursor on the frame you want to start

2) Add the start blur value effect

3) Clic on the +add key frame

4) Move the cursor to the last frame where the effect would end

5) Clic on the +add key frame

5) Add the blur final value effect that you want to end

THIS IS NOT REAL BECAUSE IS NOT WORKING... so how to it ?

Thanks