RENAMING IMAGES - go to the Image icon on left - 3rd from bottom. Click SHOW MORE and you will see all of the images I posted.  Click on any one of the circles with the 3 dots to get more options.  RENAME is here.  I renamed the first few in there so you can see what I did.  You can keep or change any names on any images.

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ADD/DELETE IMAGES TO GALLERIES - go to the gallery you want to make changes to in Edit Mode.  In upper right hand corner click on MANAGE GALLERIES.  From here you can add images. 

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SAVE YOUR WORK  If you don't PUBLISH or SAVE and leave a page - you will lose your work.

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