How to delete text from an edited picture in preview?
There is a way to remove text from a picture that you have added with Apple's Preview application.

Open the picture with Preview, try to find as area where the background is the same as where the text is. 


Select an area with the mouse, and copy it and paste it into the picture. 
It will pop up in the center of the picture.
Use the mouse to move it over the text.
You can paste it several times as needed.
Save and quit the application.
Re-open Preview and Open Previous. 


Select the picture you just edited and the text will be gone.