How do I reset a user password in SQL Management Studio Express?

I am developing a windows application that is currently connecting to a sql database. Here is the connection string I am using:

<connectionString>Data Source=(local)\SQLEXPRESS;Initial Catalog=Fundamental;Persist Security Info=True;User ID=FundamentalUser;Password=pass</connectionString>

When I go into SQL Management Studio Express, and then go to the local sql server/Security/Logins. I then double clicked on FundamentalUser to find the the SQL Server Authentication password is 15 characters long. I changed the Password to 'pass' and the the Confirm Password to 'pass'. When I hit 'OK' and go back into it, it did not save the password to 'pass'

Does anyone know how to change or reset the passwords within SQL Management Studio Express?
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Chris MangusDatabase AdministratorCommented:
You're doing the right thing.  Don't assume it isn't changing the password just because the number of characters in the password mask doesn't match the number of characters in your password.  It's that way by design so nobody can tell the length of your actual password.

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ALTER LOGIN LoginName WITH PASSWORD = 'newpassword';
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