First you have to have the pictures of the wheels of course. These must be adjusted to a 800x800 pixel image with a transparent background, example from photoshop:

Save them as *.png.

Convert the pictures to base64, for example using this online tool. Save the base64-code results for later use.

Copy a template and rename it

either
template_code-wheel-2wheels.HTM (for code wheel with 2 wheels)
or
template_code-wheel-3wheels.HTM (for code wheel with 3 wheels)

Edit the HTM file with any HTML editor (Notepad++ works fine)

2-wheel:

• Lines 5, 6, 7, 520, 521
  • change title and name of the game
• Line 385
  • copy the base64-code from (2) for the background-wheel and replace the current base64 code
• Line 393
  • copy the base64-code from (2) for the top-wheel and replace the current base64 code
• Line 487
  • change the value for "var angled=" to the result of 360 / wheel positions
    (e.g. Monkey Island has 15 pirates so it's 360 / 15 = 24)

3-wheel:

• Lines 5, 6, 7, 527, 528
  • change title and name of the game
• Line 384
  • copy the base64-code from (2) for the background-wheel and replace the current base64 code
• Line 392
  • copy the base64-code from (2) for the middle-wheel and replace the current base64 code
• Line 400
  • copy the base64-code from (2) for the top-wheel and replace the current base64 code
• Line 494
  • change the value for "var angled=" to the result of 360 / wheel positions
    (e.g. Monkey Island has 15 pirates so it's 360 / 15 = 24)