Log On with Different Credentials
Solution: After you have logged on to a SharePoint site, you might want to switch to a different user. You do so by clicking the Welcome [your name] link at the top of the page to open a drop-down menu and selecting Sign In as a Different User from the options (see Figure 2.4). After clicking that option, you are prompted for your username and password, as if you have not logged on to SharePoint before.
Figure 2.4 Signing in as a different user.
If you change your mind and want to log on again with the username and password that you used to log on to your machine, you can either type in the username and password or close the browser and open the site again.