Add people and companies to Contacts on Mac
Add people and companies to your contacts list, with information such as their address, telephone numbers or email addresses. You can even include birthdays, notes and pictures.
Tip: You can import contacts from a file or add them from other apps — for example, add contacts from emails you receive.
Note: If you use more than one account in Contacts, new contacts are added to the default account you selected in Contacts General settings.
In the Contacts app
on your Mac, click the Add button 
at the bottom of the window, then choose New Contact (or use the Touch Bar).To enter contact information, click the grey text next to a field label.
You don’t need to fill in every field — empty fields don’t appear in the contact card.
Add a company: Click the Company tickbox. You can enter a company contact person in the First and Last name fields below the Company name field.
Add an international phone number: Enter the plus sign (+), country code and phone number.
Tip: If you travel often to other countries or regions, make it easier to call your family and friends back home by adding the plus sign (+) and your country code to their phone numbers in Contacts.
Include a phone number extension: After the phone number, enter a semicolon (;), then the extension number.
Add pronouns: Click the Select Pronouns pop-up menu, then choose Personalise. Click the Language pop-up menu and choose an option, enter the contact’s pronoun in each field, then click Add Pronouns.
Note: When you share your contact information through Contacts, by default your pronouns aren’t shared. When you share another contact’s information, their pronouns are never shared.
To add a picture, click the circle next to the contact name.
Click Done to save the changes.
Note: If you use an Exchange account, those contact cards can include only three email addresses, and there are limits on the number of phone numbers, names, messaging addresses and street addresses.
When you sign in with the same Apple ID on each of your devices and turn on Contacts in iCloud settings, your contacts are available on all your devices, and changes you make to contacts on one device appear on the others.