I am complicated when assigning “KeyFrame” to the parameters.

example, I put it in these parameters or others as I show here in the screenshot, and I know it's that way,
but my problem is: assign the KeyFrame several times in the same chosen parameter ?

and what is the key in the keyboards that do it ? .

Once assigned this reference that I put here in the screenshot, at the second time KeyFrame is already off there in the screenshot, I mean, I can not choose more than once.

please help.

You can just hit ‘K’ to set a keyframe on all the scoped channels.