Find IP address on the Yealink phone - please click here to see how to find this.
Next enter the IP address into the address bar of a web browser. This will take you to the Yealink web interface for your phone.
At the login page enter 'admin' for username and 'admin for password.
Please note that for some Yealink phones the last 6 digits of the Mac address (found on the bottom of the phone) is needed for the password.