Faten Rafie, it depends on the circumstances. Please follow Customer Service's advice above and write to misconduct@geni.com when you have concerns about curator actions.
If a public profile anyone can edit without asking, but of course within certain standards, - and if too close to a user you would usually ask.
That is the whole idea of Geni's world tree: everyone can contribute. Read more about the world tree: https://www.geni.com/worldfamilytree/learn-more
If you want a tree for your own Geni is probably not the correct site for you.