--Get PasswordSalt & Password Format
SELECT * from aspnet_Membership

--Get User ID
SELECT * FROM Users

--Get Portal ID
SELECT * FROM PortalAlias

--Get Application Name
SELECT * FROM aspnet_Applications

--Change Password, RUN aspnet_Membership_SetPassword Stored Procedure
EXEC aspnet_Membership_SetPassword 'applicationname', 'username', 'newpassword', 'passwordsalt', 'passwordformat'

--Confirm
SELECT * from aspnet_Membership