Not all of your contacts that you want to add may be found in your other contact lists. There will be times when you want to add a contact directly to your Contacts list in your Calendar account. Here's how you do that.
Open your Calendar account and select "Contacts" from the menu located on the left side of the screen.
Within that list, you'll see a plus sign with "Add Contacts." Click on the plus sign. This will take you to a new pop-up screen shown below that says "Create Contact."
Fill in the information for that contact and select "Create" as shown below.
Once you select "Create," you'll then see that contact listed under "My Contacts."