You need to save the project with the wrong name as a template and then create a new project with the right name from the template so you do not lose any data already in the project with the wrong name.
Right click on the project name and chose Save As Template. Give the template a unique name and let it save. Then create a new project with the right name and title and use the option to create from a template instead of creating from a blank project or copying from an existing project. After you are done creating the new project you can delete the template and project with the wrong name.