How do i make gravity

Fill this out this info to make it easier for the community to help you! If you don’t fill out this information, your post may be deleted or removed.

What Wick Editor Version are you using?
1.19.3

Describe the Problem
i cant figure out how to make gravity

What have you tried so far?
Ive tried to take gravity from other games

Do you have a Wick Editor File that we can see? Optional*
My Project2-15-2021_10-55-19.wick (57.1 KB)

im trying to make a 2 player fighting game if you can fix it andsend me the link that would be helpfull.

never mind i fixed it I changed
this.y=ground.y-((ground.height/2)+(this.height/2)-1);
to
this.y=ground.y-((ground.height/2)+(this.height/2)+120);