sql server mixed mode authentication question

I set my sql server to sql server mixed mode authentication

Question
I add this Windows account, for example domain name\johnsmith to SQL server login
If I want to log into SQL server by this Windows account like domain name\johnsmith on SQL authentication, not on Windows authentication
Can I do that?

My SQL server is SQL 2012
wasabi3689Asked:
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Shaun VermaakTechnical SpecialistCommented:
You either login to the server with the Windows account or RunAs SSMS as a different user
wasabi3689Author Commented:
I don't understand this part " RunAs SSMS as a different user",

More specific, or example
Shaun VermaakTechnical SpecialistCommented:
Shift+Right-Click on shortcut
ssmsrunas.png
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David Johnson, CD, MVPOwnerCommented:
it is either/or they are totally independent of each other
sql login authenticates by the sql server
windows login authentication is by AD/computer
Vitor MontalvãoMSSQL Senior EngineerCommented:
What tool are you using to connect to the database?
If you use SSMS then it will use the credential of the current user (the user that's actually logged in his/her computer). To run with the credentials of another user you must use the RunAs option and provide the new credentials to connect to the database.
Vitor MontalvãoMSSQL Senior EngineerCommented:
wasabi, a feedback will be appreciated.
Cheers.
David Johnson, CD, MVPOwnerCommented:
sql authentication and windows authentication are completely separate. so you can't do what you want
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