I want to update my iPhone 13 Pro

Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

rosey244 Said:

"I want to update my iPhone 13 Pro: I want to update my phone"

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Updating an iPone 13 Pro:

Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. See my User Tip: Update your iPhone Using a Computer - User Tip. If any updates are availabe, they will install, sure enough