hi ,

hi have this

    "GroupName": "donator",
    "Priority": 0,
    "Title": {
      "Text": "[Donator]",
      "Color": "#dba901",
      "Size": 12,
      "Hidden": false,
      "HiddenIfNotPrimary": false
    },
    "Username": {
      "Color": "#55aaff",
      "Size": 15
    },
    "Message": {
      "Color": "#dba901",
      "Size": 15
    },
    "Format": {
      "Chat": "{Title} {Username}: {Message}",
      "Console": "{Title} {Username}: {Message}"
    }
  },
​

on title its color okay the color on messages is white ... why?

You most likely have another group with the same or higher priority (lower number) than "donator" which has white as the message color.
The message and name color are taken from the users primary group, which is the group the user in in with the highest priority (lowest number).

"Priority": 0, its standart i must be chang it?

Yes, you should not have multiple groups with the same priority.