Photo I submitted was approved for page on Hyla Marrow over a week ago, but doesn't show up. Maybe I submitted the wrong format or URL?

OK, so it seems I can add a photo to a movie or TV show page, but not to a page devoted to an actor.  How can I find out who "owns" a particular actor's page?

You need to be a  IMDbPro member to see contact information.
https://pro.imdb.com/name/nm0550276?rf=cons_nm_chgpimage&ref_=cons_nm_chgpimage
However there may be no contact information in which case you would need to claim the page to add photos.
If you claimed the page as her manager or agent you should be aware all the photos you upload will be removed on expiration of your IMDbPro membership.
Claim your page

Nothing wrong with my comprehension. Only in your head there is.
Good job by you however. 6/10

Thank you for all your help. I understand now. To clear up any confusion about me,  let me just say that I was helping out the Executor of Hyla's Estate (she died in 2016) and noticed how little there was about her on imdb. Since I had additional info (like her death certificate) I thought I'd try to beef it up.  I also have one of her SAG photos that I thought would be nice on there. I'm not her agent, or a relative, nor did I even meet her, so I'm not interested in maintaining her page. But I discovered she actually had a pretty interesting career (i.e. she was Mia Farrow's stunt double in her Woody Allen movies) and thought I could add that to her page so there was something people could learn about her. I plan to add that as a bit of trivia along with some other tidbits. Hopefully I can submit those without a fee.  Thanks again for all your help!