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). I’m trying it now and that seems to work.


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