Change the SA user password in SQL Server

Open the SQL Server Management Studio and log in with the SA or Window Authentication to the Server.

Expand the Server –> Security –> Logins as follows:

Right-click on SA user and click on properties. The following window will be shown from which you can easily change the SA password.

Using Script you can also change the password:

-- Login with Window Adminstrator or SA or any other administrator:

USE [master]
GO
ALTER LOGIN [sa] WITH PASSWORD=N'Password@123'
GO