Editing an image
There are number of ways in which you can edit images, before you add them to your website.
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Edit with the Image dialog
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When you open an image with the image dialog you are given the option to rotate or crop an image from within the dialog. Just click on the appropriate button to choose the option you want.

Edit with external image editor
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You can also edit images with your preferred image editor whenever you see this button below an image selection box:  .