Once you have cropped the image, you will want to scroll down to the bottom. This will show you where you can choose if you want the image to be in the center of the page, to the left or to the right of the page. See picture below.

You can also choose to make the image into a circular image by choosing circle. I love this feature. For instance if you just want the picture of the face that is in the image, or of just one object of the original image.

Now that you are done, all you need to do is scroll down to the bottom and click on the blue button that says "Save and Insert" and your picture is now there in your post/page.