You can use Notepad or any other JSON file manipulation app to modify this

{
  "identity": "skinmatics:profiles/<profile>", // Change <profile> to your profile file name, this is Utilitary way of loading config files
  "enabled": true, // Wheter this Skinmatics profile is enabled
  "maxTicks": 0, // In ticks, numbers above 0 will tick your skin, resulting in an animated texture. The amount of ticks to do a texture change is maxTicks - 1
  "strongerEmissiveGlow": false, // Use the same rendering method as spider eyes (glow in the dark and not affected by light)
  "useCustomSkin": false, // Use the profile's skin texture instead of your Minecraft account skin texture
  "addEmissiveSkin": false, // Add emissive layers to your skin
  "showCape": true, // Show cape texture, elytra cape texture included
  "useCustomCape": false, // Use custom cape texture, elytra cape texture affected if not using custom elytra texture
  "addEmissiveCape": false, // Add emissive layer to your cape
  "useCustomElytra": false, // Use custom elytra texture
  "addEmissiveElytra": false, // Add emissive layer to your elytra
  "showEyes": false, // Show eyes
  "addEmissiveEyes": false, // Add emissive eyes to your skin (if showEyes is true)
  "rightEyeHidden": false, // Hide your right eye
  "leftEyeHidden": false, // Hide your left eye
  "blinkingChance": 48, // Chance to blink for every tick
  "holdBlinkingFor": 4, // How many tick it took to blink
  
  // These fields use the same format
  // "<Image Path>": [<Ticks>]
  // <Image Path> refers to the image texture, can be from the game resource packs (minecraft:textures/...) or imported from `config/skinmatics/textures`
  // [<Ticks>] refers to the tick time for the texture to switch
  "skin": {
    // Example (if maxTicks is 20, textures can be changed between 0-19)
    "skin/my_skin": [5, 15] // Use this texture at tick 5 and 15 (if no textures start at tick 0, then it will use the end tick's texture). This texture file path is config/skinmatics/textures/skin/my_skin.png
    "minecraft:textures/entity/player/wide/steve": [10, 19] // Switch to this texture at tick 10 and 19 (and use this texture at tick 0-4 since there's no texture at tick 0)
  },
  "emissiveSkin": {},
  "cape": {},
  "emissiveCape": {},
  "elytra": {},
  "emissiveElytra": {},
  "rightEye": {
    "closed": {},
    "front": {},
    "up": {},
    "down": {},
    "right": {},
    "rightUp": {},
    "rightDown": {},
    "left": {},
    "leftUp": {},
    "leftDown": {}
  },
  "leftEye": {
    "closed": {},
    "front": {},
    "up": {},
    "down": {},
    "right": {},
    "rightUp": {},
    "rightDown": {},
    "left": {},
    "leftUp": {},
    "leftDown": {}
  },
  "emissiveRightEye": {
    "closed": {},
    "front": {},
    "up": {},
    "down": {},
    "right": {},
    "rightUp": {},
    "rightDown": {},
    "left": {},
    "leftUp": {},
    "leftDown": {}
  },
  "emissiveLeftEye": {
    "closed": {},
    "front": {},
    "up": {},
    "down": {},
    "right": {},
    "rightUp": {},
    "rightDown": {},
    "left": {},
    "leftUp": {},
    "leftDown": {}
  }
}