How to disassociate Apple's mobile phone?

Take the iPhone 6 mobile phone as an example. The logout method is as follows:

First open the iPhone 6, then find the "Settings" item on the desktop of the iPhone 6, and click Enter.

2. After entering the setting interface, click the position in the red box below to enter.

Third, then find the mobile phone to disassociate, and click Enter.

4. Click "Remove from Account" after entering.