Now in the alpha channel ( you may need to have control clicked on the black area of the fire image by the way to set this as an alpha color, but I think the shaders are auto alpha)

yes in the alpha channel click to add a fusion shader, you will see the fire drops in as the base and we need to add a noise shader for the mix

I set it as you see in the image to the left, play with these settings as you want

I also used the default noise but you may want to change this, animate and or scale it

I added a glow just for the thrill of it

Drop the mat onto the plane and try a test render