Add A State To Table That Is Already Created?

I have this table that I thought I could just do a normal update to because I need to add a state and ID.

How do I add a state to a table that is already created?

Here is the behind the scenes. I have never had to deal with something like this.

This is what it looks like

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[RegionStates](
[RegionID] [smallint] NOT NULL,

[code]....