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r- how to edit elements on x axis in image.plot

I have created a image plot for this data:

sample
         p         p.1         p.2         p.3         p.4
  p    1.0000000  0.24077171 -0.66666667 -0.49009803  0.61237244
  p.1  0.2407717  1.00000000  0.09028939 -0.83444087  0.14744196
  p.2 -0.6666667  0.09028939  1.00000000  0.21004201  0.10206207
  p.3 -0.4900980 -0.83444087  0.21004201  1.00000000 -0.08574929
  p.4  0.6123724  0.14744196  0.10206207 -0.08574929  1.00000000

Using this code:

  image.plot(sample,col=redblue(191), zlim=c(-1,1))

I get this image:

Instead of 0.0 0.2 0.4.. on x and y axes, I want p p.1 p.2...
How do I get that that?
Thank you for your time and consideration?

My heatmap looks like this:

its not symmetric. Can you please fix this?
I am using this code:

shades=c(seq(-1,-0.5,length=64), seq(-0.5,0.5, length=64), seq(0.5,1,length=64))

heatmap.2(sample, dendrogram='none', symm=TRUE, Rowv=FALSE, Colv=FALSE, key=TRUE, cexCol=0.7, cexRow=1,scale="row", keysize=1, col=redblue(191), breaks=shades)