You have to go to the three little dots on the right side on your screen in chrome by the url bar, and click settings down towards the bottom. Once you're in settings, you'll see "On startup" with three different choices. The way I do it, is click "Open a specific page" and type in www.google.com
According to you have to http://windows.microsoft.com/en-PH/windows-8/sign-in-out-of-windows
you have to click on the account picture on the upper right hand corner to
access the backstage view and you have to tap or click the account tab to view
the account gallery and sign out from the account. You may also want to check
this link as well: https://support.office.com/en-us/article/Sign-out-of-your-Microsoft-account-268b49c8-398f-4057-8a3f-e376789f273a
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I recommend asking another category, not sure which one but computers and technology is not a good start. Keep looking and good luck!