To edit a picture using MS Paint, follow these steps:

1. Open the image in MS Paint by right-clicking and choosing 'open in Paint'. 

2. Find the 'rotate' function at the top left part of the screen and click there until the image is straight. 

3.Save the image.

4. Return to to reupload it.
Please refer to the illustration below

Remember, The photos must be of the item for sale. Collage style photos are not permitted.