I’m trying to make the GUITexture(called ‘ready’) appear and disappear after 2 seconds, so i used the following code:
IEnumerator abertura(){
ready.enabled = true;
yield return new WaitForSeconds(2);
ready.enabled = false;
}
But it isn’t working. How to do it right?
Do you call function with StartCoroutine(aperture()); ?
No, i neither know what is this… 
Well all IEnumerator functions you need to call with StartCoroutine();

Can you post a sample code, please?
void Start() {
StartCoroutine(abertura());
}
IEnumerator abertura(){
ready.enabled = true;
yield return new WaitForSeconds(2);
ready.enabled = false;
}