To acces to this feature you have to hold pressed the pictogram for 3 seconds. You will see a screen like at the right side. In this screen you will see the image of the pictogram, if you want to change it, press on that image and select the most appropriate option. When you press to change the image you will see three options, the first one is to take a photo with the camera, the second one is to select an image from you gallery and the last one is to select one pictogram of our pictograms gallery.
If you want to change the text of the pictogram you will see the actual text at the left side of the screen, modifies that text and it will be automatically changed.
And the last thing you can change in this screen are the "sons" of the pictogram, they are at the bottom on the left side of the screen. If you press on one of this "sons" you will enter to another pictograms screen, you will see that is the same screen but with another options, you can change the option like you do recently and this will automatically change the "son" of your pictogram.
Another interesting options are the action bar options, here you have the chance to create a new pictogram or to revert the changes you have make it.
To save the change you can press on the check mark or backpress and select yes.