Welcome to Allpar. This should be part of the turn signal switch in the column. There should be a pull button at about the 4 o'clock position, or a hole for it at least. This button is held in by a small phillips screw and the parts may be lost or somewhere in the truck if they fell out?
hey, just noticed your warlock has stacks on it like the "little red" this was not an option in North America was it a factory option in Brazil or did you or someone put them on? they look kinda cool on there, my son has a Warlock clone