How can I update macOS 13 on my MacBook Pro

iOS is for iOS devices such as iPhones and iPads. To learn how to update macOS please read Update macOS on Mac - Apple Support.

If you meant to update your MacOS to “13” Ventura see link already provided.

Note that if your MacBook Pro is 2016 or earlier, you may only be capable of running MacOS 12 (Monterey).

In that case you’ll not see updates available.

macOS Ventura is compatible with these computers - Apple Support

macOS Sonoma is compatible with these computers - Apple Support

macOS Sequoia is compatible with these computers - Apple Support