Hi kmuthus-2347,
Welcome to Microsoft Q&A.
Do you mean you want to create a SQL Server login to connect to SQL Server? As others mentioned, SSMS is a tool to monitor and administer instances of SQL Server and we can login to SSMS without SSMS login. If I misunderstood, please feel free to let me know.
To create a SQL Server login, you can right-click the Security folder, point to New, and select Login. Then select SQL Server authentication in the New login page-> General tab.
Please refer to Create a Login for more details.
Best Regards,
Amelia
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