Can not find contact list.Clicking on To,CC or BCC doesn't give list. What do I need to click to get the contact list?

[Windows Central Question]

Can not find contact list.Clicking on To,CC or BCC doesn't give list.

What do I need to click on to get contact list ? Tried clicking on To,CC.and BCC. doesn't do anything.Haven't seem then since I downloaded Windows 10.