Use a New Call Button
Three controls open the same call screen:
Select New in the upper-left corner, then select New Call.
Open Calls, then select the orange New Call button above your recent calls.
Select the phone icon at the bottom of the menu.
Call From Your History
Open Calls and find the number or contact in your call history. Select the phone icon beside the entry to call them.
Call a Contact
Open Contacts from the menu. Hover over a contact, then select the phone icon beside their name