To find out the name of your SharePoint column for use in a trigger condition; navigate to your SharePoint list, click the Cog at the top right and click on List Settings, then click on the name of your column. The column name will be displayed in the address bar URL after 'Field=', copy all of the text after this and paste it into the Column Name fields above.
Array should only be used in the Filter Array action and will not work as a trigger action. When using this with multiple conditions, please ensure all conditions are of type Array.