I can't change the walk speed of my player

Good evening

in a video tutorial I saw that you can change the speed of the player by selecting the character in the outliner, then in the search module, we tape walk, we change 600 by 100 to slow, or not 1000 to accelerate for example

the problem when I do this, it shows me nothing, I type walk in the search bar I see nothing appear? even the speedWalk function it does not exist in the blueprint

Help me please !

please see the attachment !!