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Users are unable to add a new field to the attribute table of a feature collection in ArcGIS Online.
This is by design. New fields cannot be added to a feature collection because the changes done to the feature collection are only temporarily reflected in the web map, and not applied to the original data.
As a workaround, follow the instructions provided below to publish the feature collection layer as a hosted feature service, before adding a new field to the service.
Note: Only the owner of a hosted feature layer or an administrator of the organization is able to make changes to the attribute schema.
ArcGIS Online Help: Feature collections
ArcGIS Online Help: About hosted web layers
ArcGIS Online Help: Publish hosted feature layers
ArcGIS Online Help: Manage hosted web layers
How To: Add a field to an ArcGIS Online hosted feature service