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It's usually near the bottom-right corner of the screen in the same vicinity as the clock. Look for the blue and white open box icon. If you don't see the icon, click the upward-pointing arrow to expand additional icons. A menu will appear. It's the second icon at the top of the window. This signs you out of Dropbox. A login screen will appear in case you want to sign in to another account. To re-link your Dropbox to Windows, click the icon, then enter your login information to sign in.
Click the Dropbox icon in the system tray. Click the gear icon in Dropbox. Click Preferences. Click Account. Click Unlink This Dropbox.