@Sakin: Hello my friend, Yes Indeed you were enough clear. The Problem was the piece in front of the computer, myself.
As I am new in the WordPress world I will let you and others who may need help what I did wrong and how I fixed:
First of all I set up my pictures for 1280 x 550 as mentioned in the instructions for the theme. Problem was I was unfamiliar with this ¨feature image¨ stuff, and english is also not my first lenguage. So I was adding the picture in the body of the text(of the post) so the picture wasnt loading. Now I understand there is a button on the right side a bit down that says feature Image, and That is the place where the image should be put.
And its working fine.
Thanks for your help and the great theme. hope my difficulties will help others!
Joao