change unit... plot R

I am not sure exactly what you want to change about the plot. Below is an example of changing how the two axes cross.

It would be easier to help you if you would make a reproducible example (reprex) rather than post pictures of your code. Here is a tutorial about that.

DF <- data.frame(X=0:3,Y=4:1)

plot(DF, ylim = c(0,4))

#bty = "n" suppresses the printing of the box around the plot. 
plot(DF, xaxt = "n", yaxt = "n", bty = "n", ylim = c(0,4))
axis(side = 1, pos = 0)
axis(side = 2, pos = 0)

Created on 2020-11-17 by the reprex package (v0.3.0)