Problem with frames

I am in trouble I did an animation and wanted to change the speed of it alternating the seconds only that is many frames but I select all of them and I type a value, however this value is only increased in the last 1 frames and the middle ones are not changed.
This is very annoying because you have to change one by one. How do I solve this?

Hm, you should be able to shift-select the frame by its number in the timeline and right-click for the Frame Properties option (or just select all the frames and hit P). Iā€™m trying it now and that seems to work.


Hello thank you It worked right here so it was just naivety my age