The current status of the property is displayed in the Publication settings block and will be changed as the property changes the state.
If the property is in Draft status and its completeness is 100% — Send on approval button is active. When you click on it, the property will be sent to Estate Spain content-editor to be approved. When you send a property on approval, the status will be changed to On approval and this button will disappear.
Any property can be in Ready to be published / On approval / Republication state — depending on previous property status and changes made to it. While the property is still on approval, it cannot be resent on approval. You can make any changes, save the result, and sent this property to be approved later, when this option becomes active (after the publication).
When a property is approved by an administrator and published on estate-spain.com, its status will change to Published and Send on approval button will become active. You can edit published properties as well, just send them on approval to be republished.