How Do I Edit an Image?
Firstly select an image from your Media Library:
You will then be taken to a page labeled Attachment Details, similar if not the same as the one below:
Select the button labeled Edit Image and you will be taken to a page similar if not the same as the one below:
Once you have completed the changes you wish to make, simply click the blue button located below the image labeled Save and your alterations will be applied.