Sign out means sign out the current account without closing TradeManager.
Please click "Menu" on the TradeManager, and then click "Logout" button.

Or right click the TradeManger icon at the right bottom of the desktop. Then click "Sign out" to sign out your current account:

You can still click "Sign In" to login to the same account again.
2. Sign in with another ID: to sign in to another account, simply sign out the current one first and enter another Member ID/email address and password. Then click "Sign In".