I have a show up on IMDB. I would like to allow a second person to edit. But when they attempt to add things, i.e. a poster, it shows up on their personal actor account. How do I let them edit the show page?
Since an IMDb Pro user account can only "claim" on Name Page, the only real way to do it is to allow the other person to use your login name and password. Remember you've "claimed" that page and he/she "claimed" his/her own page. Those user accounts are now "linked" to the perspective Name Pages. The only other way would be for you to both unclaim the pages, then let him/her claim the page needing the updates.
A poster on a film's Title Page needs to be paid for and added through the Publicity Service; this is quite distinct from the Resume Subscription which allows that account to add photos to a specific Name page.