Creating a custom field for Contacts
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Go to your Settings in the bottom left corner of your screen
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Click Fields
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Make sure you selected Contacts and click Add field:

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Choose the field type
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Enter the field name
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Choose to make the field appear when adding a new Contact
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Choose to make the field required
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Choose to have the field as a filter option in your Contact page
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Click Add field

Using Contact Fields
Filling in custom fields for a new Contact
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Click Contacts, next click New Contact
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Fill in the required fields (basic and custom fields)
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Click Add (top of the screen)
Updating custom fields of an existing Contact
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Click Contacts and select a Contact
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Go to the Info tab
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Modify one or more fields by clicking on it and typing or clearing its value
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The Contact is automatically saved
Configuration
Creating a custom field for Users
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Go to your Settings in the bottom left corner of your screen
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Click Fields
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Make sure you select Users and click Add field:

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Choose the field type
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Enter the field name
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Choose to make the field appear when adding a new User
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Choose to make the field required
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Choose to have the field as a filter option in your User page
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Click Add field

💡 Please note that when adding a new User, you'll need to fill in the required information (even as an administrator).