No option to Port phone number

Hi! I just signed up for Zoom Phone, and wanted to port my number. All the documents indicate that there should be a Porting option under the Phone System menu, but the only thing there for me is Setup.

If I go into setup, there is no option to port my number, only an option to set up a new number. I don't want a number, and I don't need one, so how can I just move my current number over here?

Thanks!

Don