[rbN.]

You done it wrong?:

Wikipedia:

https://sampwiki.blast.hk/wiki/SetPlayerChatBubble

Code:

public OnPlayerText(playerid, text[])
{
  SetPlayerChatBubble(playerid, text, 0xFF0000FF, 100.0, 10000);
  return 1;
}

Quote:

(playerid, text[], color, Float:drawdistance, expiretime) playerid The player which should have the chat bubble. text[] The text to display. color The text color drawdistance The distance from where players are able to see the chat bubble. expiretime The time in miliseconds the bubble should be displayed for.

I don't know if im right, coz im sux scripter =D