Changing a name for a story can be done by imagining what kind of impression you want the name to give. It could be something simple and easy to remember, or a complex and mysterious one. Also, try playing with syllables and sounds to create an interesting name.
To change your story to free, you might consider self-publishing on platforms that allow free content sharing. Also, you could offer it for free temporarily to gain more readers and build a fan base.
Well, you usually do it through the settings or options menu of the platform where you're publishing or editing your story. Just look for something like 'story settings' or 'edit story details'.
You usually need to look for the settings option within the game. There should be a specific section for name changes. But keep in mind, some games might have restrictions or requirements for doing this.