Hello evgen50,
It sounds like you’re looking for guidance when it comes to dialing a phone number using the FaceTime app on your Mac.
Is that correct? If so, you’re in the right place to get help.
When time permits, please try the steps in the link below in the section titled “Make calls from apps on your Mac.”
Make and receive phone calls in FaceTime on Mac - Apple Support
Reading through the steps above can help to resolve your issue.
However, if you notice that you’re still stuck after trying the steps above, reply with what you’re observing on your end for more help.
Thanks for using the Apple Support Communities.
Cheers!