Connecting a wifi extender

mjcbone wrote:

How can I see all devices connected to my WiFi on macbook pro?

It is difficult to understand your question.

If you are asking how to see all WiFi devices connected to your local WiFi Network, log into your router's admin page and there should be a list of connected devices.

If you are asking what WiFi networks can be seen by your computer, go to system preferences network and look at the list of available networks.

If you are asking something else. please provide more details/context.