Click on 'Settings' the gear icon at the top right
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On the left-hand side, below Data Management > Click "Properties"
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Navigate to [https://app.hubspot.com/property-settings/5004810/properties?type=0-1&action=create](https://app.hubspot.com/property-settings/5004810/properties?type=0-1&action=create)
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Make sure the right object type is selected from the dropdown
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For this example > Click "Contact properties"
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Click to "Create property"
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From the window that appears on the right, click the "Select group" dropdown to choose what property category this will fall under.
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Type into 'Label' what you would like to call this property
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Once named > Click "Next"
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Click the dropdown to "Select field type"
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As birthday will be a date selection > Click to Choose "Date picker"
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Finally, Click to "Create" this will now live on the contact record