How do i change windows from being my log on to computer to dell ?

I have dell computerHow do i change windows from being my log on to computer to dell ?
what the hell are you trying to ask here??? if you are saying you don't want it to log in with windows then you will need another OS dell doesn't have an operating system of its own.How do i change windows from being my log on to computer to dell ?
Could you please clarify your question.

Thanks, E