The project-owning organization can create the types of packages the project will use.
This process should be run by a Packages Administrator.
Note that you can only edit the package type code and name if no packages have been created from it.
If you need to edit the name or code of a Package Type you can do so using the edit icon by a package’s name. You can access this from Setup/Project Settings/Package Types.
You can delete package types but only if they haven’t been used yet. This can be helpful if you’ve dozens of types and want to clean up the list by reducing the amount available. You can see if they haven’t been used by rolling the mouse over a row. If the bin icon appears to the right, then that package can be deleted.