Spline behaviour of keyframes

EDIT - you just have to click on the actual linking curve itself to be able to change the function. My intuition was that I either selected the keyframe or pair of keyframes themselves to change function - which has no effect…

I found this old post - which is exactly what I want to know as spline behaviour seems locked to curves - but it didn’t get a reply so I’m asking in a fresh post :

how can i change the spline bahavior of a keyframe? I can’t change for eg. the length of an anchor of a keyframe. Also the behavior linear, bezier etc. will not change. Maybe i am just missing some shortcuts but can’t find them.

edi

Cheers
Al

Also, in case you haven’t found it, once you set a curve to ‘bezier’, you can break tangents into separately controlled by pressing t key with a key selected. Pressing ‘t’ again will snap them back together.