I have created a custom object. As per the documentation, to create a trigger it says go to Setup | Create | Objects. When I go to the triggers section there is no "new" button??? How do you create a trigger please? 

I have created an object and after initial save it allows you to create fields etc. When I go back and edit this object, I can no longer add custom fields. Where do you do this?

I have created a custom object. As per the documentation, to create a trigger it says go to Setup | Create | Objects. When I go to the triggers section there is no "new" button??? How do you create a trigger please? 

I have created an object and after initial save it allows you to create fields etc. When I go back and edit this object, I can no longer add custom fields. Where do you do this?