Windows Phone 8 Basics - Share things on my phone - To edit a photo

After taking a photo, you can rotate it, crop it, or apply the fix filter. Fix will automatically apply some of the most common photographic fixes—exposure, color temperature, and shadow/highlight adjustment—in a way that's tuned for each photo.

In the App list, tap Photos Photos icon.
Find the photo you want to edit and tap to open it.
Tap More More icon > Edit.
Do one of the following:
To rotate the photo, tap Rotate Rotate icon as many times as necessary until your photo is right-side up.
To crop the photo, tap Crop Crop icon. Tap and drag one of the corners of the rectangle, or tap Aspect ratio Aspect ratio icon to choose a specific ratio (such as 16x9) and drag the rectangle, and then tap Done Done icon.
If the color of your photo doesn't look quite right, try tapping Fix Fix icon. If you don't like the way it looks afterward, just tap Undo fix Undo fix icon to undo.

Tap Save Save icon to save all your changes.