Hi John,
I'll give you a few hints and tips to start. You need to login to Element Manager (web gui) which is usually available on the Succession Signaling Server. Once you have logged in you need to upload the firmware file to the Signaling Server and then distribute it out to all the components (Signaling Servers, Voice Gateway Media Cards, etc). Once you have distributed the firmware file out the phone should upgrade the next time it restarts.
Navigate to the following and upload the new firmware file;
IP Telephony -> Software -> File Upload
Once the file is uploaded you need to navigate to the path below;
IP Telephony -> Software -> Phone Firmware
Select the firmware version (file) you just uploaded and distribute it out to the node.
That should be it!
Good Luck!