How do I set up a Cisco 8861 phone?

You'll have to update your Cisco to the latest firmware first - which is done via downloading the firmware from a TFTP server. Without the latest firmware, these options won't appear!

To setup your VoIP account on your phone you will need your SIP User <your_SIP_username>, <your_password> and host talk.yay.com.

This information can be found in your dashboard under Users

When you log into your Cisco IP's address, you'll need to make sure you are logged in as administrator on the web page and select basic settings, as seen in the screenshot below: