Concept: Flame is applied over the text using Adobe Photoshop. This type of effect need lots of step with minute image adjustment commands to get realistic output. You can experiment with the intensity of the image adjustment commands you want to use. Work carefully towards getting the proper effect and understand the flow of the procedure. We need to use black colored text so that the flame on the text will be prominent.
1. Create new file with 72 PPI
and white background. The mode has to be Grayscale. Type the text
with thick font.

2. Layer > Flatten Image
3. Filter > Stylize > Diffuse
(mode "Darken Only")

4. Blur > Gaussian Blur
(Radius 1.0)

5. Distort > Ripple

6. Image > Mode > Index
Color
7. Image > Mode > Table Color
(Choose "Black Body ")

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