Create an admin user for Microsoft SQL Server

If you're trying to add MS SQL Web or Standard to your server that uses Plesk, you need to create a separate administrative user for SQL Server

1. Connect to your Windows server with Remote Desktop Connection.
2. From the Start Menu, open SQL Server Management Studio.
3. Connect to your database as your Remote Desktop user. SQL Server Management studio should load this automatically.
4. On the folder tree on the left, expand Security.
5. Right-click the Logins folder, then click New Login.
6. Type the username you want to create into the Login name field.
7. Select SQL Server Authentication.
8. Enter and confirm a password for that user.
9. Clear the check box for Enforce password policy to make sure that you are not having to reset your SQL Server password frequently.
10. Click Server Roles on the left-hand menu.
11. Select the box for sysadmin.
12. Click OK.

You can now use this admin user for creating and managing your SQL Server databases.