I have a picture that is in the wrong person's memory. How do I move it without deleting it?
The picture shows in a person's memory because it has been tagged to that person.
Here is an article from the Help Center giving instructions for removing or deleting tags. This does not remove the picture from your memories gallery, just from the person's memory page.
Here are some of the instructions from the article:
We hope this helps.
You should attach it to the correct person first if you intend to do so. Then follow the instructions above.