How can I connect Apple Messages to receive Messages in texts on iPhone?

Just read I can do so bthese steps:

Open Messages (on iMac)--> Preferences--> iMessages (tab), then √ my phone number..

PROBLEM IS my phone number IS NOT listed, the list is only my apple email and iCloud email. How can I add my iPhone 13pro to the list in order to receive texts when i receive a message on iMessage on my iMac.

Also below photos of iPhone-->settings--> messages-->send receive and the 2 emails AND my phone number is shown.